# 2018 in arthropod paleontology

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This list of fossil arthropods described in 2018 is a list of new taxa of trilobites, fossil insects, crustaceans, arachnids, and other fossil arthropods of every kind that were described during the year 2018, as well as other significant discoveries, and events related to arthropod paleontology that are scheduled to occur in the year 2018.

## General research

* A study on extant arthropods (mainly insects and spiders) living around the resinous tree Hymenaea verrucosa in the lowland coastal forest of Madagascar and trapped by the resin produced by this tree species, and on their implications for inferring whether amber records the true past biodiversity of the entire forest, is published by Solórzano Kraemer et al. (2018).
* A study on the early evolution of stem and crown-arthropods as indicated by Ediacaran and Cambrian body and trace fossils is published by Daley et al. (2018).
* A study on the evolution of ecdysozoan vision, focusing on the evolution of arthropod multi-opsin vision, as indicated by molecular data and data from fossil record, is published by Fleming et al. (2018).
* Grimaldi et al. (2018) report biological inclusions (fungi, plants, arachnids and insects) in amber from the Paleogene Chickaloon Formation of Alaska, representing the northernmost deposit of fossiliferous amber from the Cenozoic.
* A mantis lacewing larva found in association with two spiders, attached to one of the anterior walking legs of one of the spiders, is described from the Cretaceous amber from Myanmar by Haug, Müller & Haug (2018), who interpret this finding as evidence of palaeo-parasitism.

## Arachnids
### Research

* Review of arachnids known from the Bitterfeld amber (Germany) and a study on their implications for inferring the age of this deposit is published by Dunlop et al. (2018).
* The first fossil representative of the parasitic mite family Pterygosomatidae, assigned to the genus Pimeliaphilus and similar in morphology to the extant species parasitic on cockroaches, is described from the Cretaceous (Albian) Archingeay amber (France) by Sidorchuk & Khaustov (2018).
* Fossil mite "Sejus" bdelloides, originally interpret as a member of Mesostigmata, is reinterpreted as a member of Prostigmata referrable to the group Anystina by Dunlop, Walter & Kontschán (2018).
* A study on the body size of fossil mites is published by Sidorchuk (2018).
* A hard tick wrapped in spider silk is described from the Cretaceous Myanmar amber by Dunlop et al. (2018).
* A male specimen of a tick belonging to the genus Ornithodoros and the subgenus (Alectorobius) is described from the Dominican amber by Estrada-Peña & de la Fuente (2018), who also provide illustrated interpretations intended to support the validity of the identity of the fossils reported by de la Fuente (2003).
* A pseudoscorpion attached to barbules of a contour feather, possibly documenting a phoretic association between pseudoscorpions and Mesozoic birds, is described from the Cretaceous amber from Myanmar by Xing, McKellar & Gao (2018).
* A study on the phylogenetic history of spiders, based on molecular data and re-examination of the global fossil record, as well as on the ancestral predatory strategies among different groups of spiders and some of the possible drivers of spider diversification during the Early Cretaceous greenhouse, is published by Shao & Li (2018).
* A study on the burrows produced by wolf spiders belonging to the genus Pavocosa, aiming to identify ichnological signatures which may facilitate identification of wolf spider burrows in the fossil record, is published by Mendoza Belmontes, Melchor & Piacentini (2018).
* Fossil crevice weaver Misionella didicostae from Dominican amber is transferred to the genus Antilloides by Magalhaes (2018).
* Evidence of a fossilized cobweb, and a possible case of predation of a theridiid spider on a dolichopodid fly, are reported from the Mexican amber by García-Villafuerte (2018).

### New taxa

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes | Images |
| Alteraraneus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Zarqaraneidae. The type species is A. gracilipes. | |
| Alteruloborus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Deinopoidea and the new family Alteruloboridae. The type species is A. araneoides. | |
| Burerythrites | Gen. et sp. nov | Valid | Konikiewicz & Mąkol | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A mite belonging to the family Erythraeidae. Genus includes new species B. pankowskii. | |
| Burfessonia | Gen. et sp. nov | Valid | Konikiewicz & Mąkol | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A mite belonging to the family Smarididae. Genus includes new species B. maryae. | |
| Burmaforceps | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Zarqaraneidae. The type species is B. amputatus. | |
| Burmascutum brevis | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Burmascutidae. | |
| Burmasuccinus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the family Uloboridae. The type species is B. bulla. | |
| Burmatheridion | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the family Theridiidae. The type species is B. sinespinae. | |
| Burphanolophus | Gen. et sp. nov | Valid | Konikiewicz & Mąkol | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A mite belonging to the family Erythraeidae. Genus includes new species B. joergwunderlichi. | |
| Chaerilobuthus knodelorum | Sp. nov | Valid | Lourenço | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A scorpion belonging to the family Chaerilobuthidae. | |
| Chimerarachne | Gen. et sp. nov | Valid | Wang et al. | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | An arachnid closely related to spiders and to the extinct group Uraraneida. Genus includes new species C. yingi. | |
| Converszarqaraneus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Zarqaraneidae. The type species is C. annulipedes. | |
| Cornicaraneus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Zarqaraneidae. The type species is C. scutatus. | |
| Crassitibia baculum | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Zarqaraneidae. | |
| Cretaceoushormiops | Gen. et sp. nov | Valid | Lourenço | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A scorpion belonging to the family Protoischnuridae. Genus includes new species C. knodeli. | |
| Cretamysmena | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Cretamysmenidae. The type species is C. fontana. | |
| Eothrombium fortesambiense | Sp. nov | Valid | Mąkol, Konikiewicz & Klug | Eocene | Baltic amber | Europe (Baltic Sea region) | A mite belonging to the group Prostigmata and to the family Tanaupodidae. | |
| Eotibiaapophysis | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider of uncertain phylogenetic placement, originally assigned to the family Uloboridae, but subsequently reinterpreted as a member of an early branch of the RTA clade. The type species is E. reliquus. | |
| Frateruloborus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Deinopoidea and the new family Frateruloboridae. The type species is F. bulbosus. | |
| Galianora marcoi | Sp. nov | Valid | García-Villafuerte | Miocene (Aquitanian) | Mexican amber | Mexico | A jumping spider, a species of Galianora | |
| Haemaphysalis (Alloceraea) cretacea | Sp. nov | Valid | Chitimia-Dobler, Pfeffer & Dunlop | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A tick, a species of Haemaphysalis. | |
| Immensmaris | Gen. et sp. nov | Valid | Dunlop, Frahnert & Mąkol | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A mite belonging to the family Smarididae. The type species is I. chewbaccei. | Immensmaris chewbaccei |
| Kachin serratus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the family Uloboridae. | |
| Leviunguis altus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis anulus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis anulusoides | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis bruckschoides | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis erectus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis glomulus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis glomus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis graciliembolus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis gradus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis porrigens | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis pseudobruckschi | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Leviunguis quadratus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the new family Leviunguidae. | |
| Microproxiaraneus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Zarqaraneidae. The type species is M. annulatus. | |
| Miomastigoproctus | Gen. et sp. nov | Valid | Lourenço | Miocene | Mexican amber | Mexico | A member of Thelyphonida belonging to the family Thelyphonidae. Genus includes new species M. knodeli. | |
| Nothrotrombidium myanmarum | Sp. nov | Valid | Konikiewicz & Mąkol | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A mite belonging to the family Trombellidae. | |
| Orchestina sakhalinensis | Sp. nov | Valid | Marusik, Perkovsky & Eskov | Middle Eocene | Sakhalinian amber | Russia | A species of Orchestina. | |
| Palaeoburmesebuthus knodeli | Sp. nov | Valid | Lourenço | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A scorpion belonging to the family Palaeoburmesebuthidae. | |
| Palaeoleptoneta nils | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider, originally assigned to the family Leptonetidae, subsequently considered to be a member of Araneomorphae of uncertain affinities by Magalhaes et al.. | |
| Palaeoleptoneta thilo | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider, originally assigned to the family Leptonetidae, subsequently considered to be a member of Araneomorphae of uncertain affinities by Magalhaes et al.. | |
| Paramiagrammopes pusillus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the family Uloboridae. | |
| Parvibulbus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the family Pholcochyroceridae. The type species is P. incompletus. | |
| Paurospina | Gen. et 3 sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Zarqaraneidae. The type species is P. curvata; genus also includes P. fortis and P. paulocurvata. | |
| Pholcochyrocer calidum | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the family Pholcochyroceridae. | |
| Pholcochyrocer vermiculus | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the family Pholcochyroceridae. | |
| Planibulbus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the family Uloboridae. The type species is P. longisoma. | |
| Praeteraraneoides | Gen. et 3 sp. nov | | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Leptonetoidea and the new family Protoaraneoididae. The type species is P. bifurcatum; genus also includes P. bipartitum and P. leni. The spelling Praeteraneoides is also used in the publication naming the new genus. | |
| Proaraneoides | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Leptonetoidea and the new family Protoaraneoididae. The type species is P. cribellatum. | |
| Propolyssenia | Gen. et sp. nov | Valid | Mąkol, Konikiewicz & Klug | Eocene | Baltic amber | Europe (Baltic Sea region) | A mite belonging to the group Prostigmata and to the family Tanaupodidae. Genus includes new species P. wohltmanni. | |
| Protoaraneoides | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Leptonetoidea and the new family Protoaraneoididae. The type species is P. longispina. | |
| Protohylomysobia | Gen. et sp. nov | Valid | Sidorchuk & Bochkov in Sidorchuk et al. | Eocene | Baltic amber | Russia | A mite belonging to the family Myobiidae. Genus includes new species P. erinaceophilus. | |
| Proxiaraneus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Zarqaraneidae. The type species is P. rarus. | |
| Ramozarqaraneus | Gen. et sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Zarqaraneidae. The type species is R. pauxillus. | |
| Spinicymbium | Gen. et sp. et comb. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Araneoidea and to the family Zarqaraneidae. The type species is S. curvimetatarsus; genus also includes "Hypotheridiosoma" falcata Wunderlich (2015). | |
| Spinipalpitibia hirsuta | Sp. nov | Valid | Wunderlich in Wunderlich & Müller | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A spider belonging to the group Leptonetoidea and the new family Protoaraneoididae. | |
| Tuckerella weiterschani | Sp. nov | Valid | Sidorchuk & Khaustov | Eocene | Baltic amber | Europe (Baltic Sea coast) | A peacock mite. | |
| Weygoldtiella | Gen. et sp. nov | Valid | Harvey et al. | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A pseudoscorpion belonging to the family Chthoniidae. Genus includes new species W. plausus. | |
| Weygoldtina | Gen. et comb. nov | Valid | Dunlop | Late Carboniferous | British Middle Coal Measures Mazon Creek fossil beds | United Kingdom  United States | A whip spider belonging to the group Paleoamblypygi and the new family Weygoldtinidae. The type species is "Graeophonus" scudderi Pocock (1911); genus also includes "Graeophonus" anglicus Pocock (1911). | W. anglica |

## Crustaceans
### Research

* Redescription of the Ordovician malacostracan Wuningia multisegmenlata is published by Lin (2018).
* A member of the erymid genus Enoploclytia is described from the Oxfordian deposits of Cricquebœuf (Normandy, France) by Devillez, Charbonnier & Pezy (2018), representing the first Jurassic occurrence of the genus reported so far.
* Redescription of Palaeopalaemon newberryi and a study on the phylogenetic relationships and life habits of this species is published by Jones et al. (2018).
* Description of the morphology of Tetrachela raiblana and a study on its implication for understanding of the homologies of carapace grooves between polychelidans and other decapods is published by Audo, Hyžný & Charbonnier (2018).
* A large-sized (12.9 mm maximum length) right valve of a marine ostracod is described from the Cretaceous amber from Myanmar by Xing et al. (2018).
* A study evaluating how sexual selection related to species extinction in fossil cytheroid ostracods is published by Fernandes Martins et al. (2018), who report that species with more pronounced sexual dimorphism had higher estimated extinction rates.
* An ostracod fauna including four species belonging to the suborder Darwinulocopina is described from the Lower Jurassic (Hettangian) Whitmore Point Member of the Moenave Formation (Arizona and Utah, United States) by Antonietto et al. (2018), potentially representing the last episode of darwinulocopine dominance in nonmarine environments before the Late Jurassic diversification of the cypridocopine and cytherocopine modern ostracods.
* Oxygen-isotope analysis of a whale barnacle specimen collected from early Pleistocene deposits of Apulia (Italy) is published by Collareta et al. (2018), who interpret their findings as indicating that the barnacle lived on a cetacean that seasonally migrated towards high-latitude areas outside the Mediterranean.

### New taxa
#### Malacostracans

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Abyssophthalmus adinae | Sp. nov | Valid | Schweitzer et al. | Late Jurassic | | Romania | A crab belonging to the family Longodromitidae. |
| Aethra stalennyii | Sp. nov | Valid | Ossó | Miocene (Serravallian to Messinian) | | Spain  Ukraine | A species of Aethra. |
| Amazighopsis | Gen. et sp. nov | Valid | Garassino & Pasini | Late Cretaceous (Cenomanian-Turonian) | Kem Kem Beds | Morocco | A member of Astacidea of uncertain phylogenetic placement, assigned to the new family Amazighopsidae. The type species is A. cretacica. |
| Anapagurus muelleri | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A hermit crab belonging to the family Paguridae. |
| Archeostenoniscus | Gen. et 2 sp. nov | Valid | Broly in Broly, Serrano-Sánchez & Vega | Early Miocene | La Quinta Formation (Mexican amber) | Mexico | A woodlouse belonging to the family Stenoniscidae. The type species is A. robustus; genus also includes A. mexicanus. |
| Armadilloniscus miocaenicus | Sp. nov | Valid | Broly in Broly, Serrano-Sánchez & Vega | Early Miocene | La Quinta Formation (Mexican amber) | Mexico | A woodlouse, a species of Armadilloniscus. |
| Asthenognathus sakumotoi | Sp. nov | Valid | Karasawa | Miocene | Korematsu Formation Lower Sandstone Member of the Bihoku Group | Japan | A crab belonging to the family Varunidae. |
| Axianassa petrea | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A member of the family Axianassidae. |
| Balsscallichirus sangermani | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A member of the family Callianassidae. |
| Bericocarcinus | Gen. et sp. nov | Valid | De Angeli | Eocene (Priabonian) | | Italy | A crab belonging to the family Macropipidae. The type species is B. alontensis. |
| Blaculla felthausetsauteri | Sp. nov | Valid | Winkler | Late Jurassic (Tithonian) | Solnhofen Limestone | Germany | A caridean shrimp. |
| Bryocarpilius stratensis | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab belonging to the family Carpiliidae. |
| Cabrillia | Gen. et sp. nov | Valid | Nyborg, Pasini & Garassino | Pliocene-Pleistocene | San Diego Formation | United States | A crab belonging to the family Leucosiidae. Genus includes new species C. hendyi. |
| Calliaxina elegans | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A member of the family Callianassidae. |
| Callichirus ornatus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A species of Callichirus. |
| Carinocalappa | Gen. et sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab, a member of the family Calappidae. The type species is C. lineamenta. |
| Cenomanocarcinus lenzenwegeri | Sp. nov | Valid | Hyžný et al. | Late Cretaceous (Santonian) | | Austria | A crab belonging to the group Palaeocorystoidea. |
| Ceratiocaris harpago | Sp. nov | Valid | Poschmann, Bergmann & Kühl | Early Devonian | Hunsrück Slate | Germany | |
| Cirolana centinelensis | Sp. nov | Valid | Maguire in Maguire et al. | Miocene (Burdigalian) | Estancia 25 de Mayo Formation | Argentina | An isopod, a species of Cirolana. |
| Cirolana titanophila | Sp. nov | Valid | Robin et al. | Eocene (Ypresian) | Monte Bolca | Italy | An isopod, a species of Cirolana found in association with electric rays belonging to the genus Titanonarke. |
| Daciapagurus | Gen. et sp. nov | Valid | Frantescu et al. | Late Jurassic | | Romania | A hermit crab belonging to the family Schobertellidae. Genus includes new species D. minusculus. |
| Daira iugata | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Late Eocene | | Italy | A crab belonging to the family Dairidae. |
| Daira pseudovulgaris | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab belonging to the family Dairidae. |
| Daranyia tricristata | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab, a member of Grapsoidea of uncertain phylogenetic placement. |
| Dinochelus radwanskii | Sp. nov | Valid | Fraaije et al. | Late Cretaceous (Maastrichtian) | | Poland | A species of Dinochelus. |
| Diogenes denticulatus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A hermit crab belonging to the family Diogenidae, a species of Diogenes. |
| Discapseudes (Miodiscapseudes) | Subgen. et sp. nov | Valid | Heard in Heard, de Lourdes Serrano-Sánchez & Vega | Early Miocene | Mexican amber | Mexico | A member of Tanaidacea belonging to the group Apseudomorpha. The subgenus includes new species D. chiapasensis. |
| Eocarpilius ortegai | Sp. nov | Valid | Artal & van Bakel | Eocene (Ypresian) | | Spain | A crab belonging to the family Carpiliidae. |
| Eopetrolisthes levistriatus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A porcelain crab. |
| Eucalliax multisetae | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A member of the family Callianassidae. |
| Eucalliax rugata | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A member of the family Callianassidae. |
| Exucarcinus | Gen. et sp. nov | Valid | Prado & Luque in Prado et al. | Early Cretaceous (late Aptian–early Albian) | Romualdo Formation | Brazil | A crab belonging to the group Raninoida and the family Orithopsidae. The type species is E. gonzagai. |
| Galathea hexacristata | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A species of Galathea. |
| Gemmellarocarcinus disalvoi | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab, a member of Dromiacea of uncertain phylogenetic placement. |
| Glyphithyreus almerai | Sp. nov | Valid | Artal & van Bakel | Eocene (Ypresian) | | | |
| Guinotosia ornata | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab, a member of the family Etyiidae. |
| Homarus hungaricus | Sp. nov | Valid | Tshudy et al. | Oligocene (Chattian) | Mány Formation | Hungary | A species of Homarus. |
| Hoploparia nasilowensis | Sp. nov | Valid | Fraaije et al. | Paleocene (Danian) | | Poland | |
| Hyastenus antiquus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab belonging to the family Epialtidae, a species of Hyastenus. |
| Hypothalassia campolongensis | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab, a species of Hypothalassia. |
| Icriobranchiocarcinus | Gen. et sp. nov | Valid | Vega in Vega et al. | Late Cretaceous (Maastrichtian) | | Mexico | A member crab related to Icriocarcinus. Genus includes new species I. tzutzu. |
| Ilerdapatiscus | Gen. et sp. nov | Valid | Artal & van Bakel | Eocene (Ypresian) | | Spain | A crab belonging to the family Aethridae. Genus includes new species I. guardiae. |
| Inachus eocenicus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab belonging to the family Inachidae, a species of Inachus. |
| Kromtitis tergospinosus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab belonging to the family Dynomenidae. |
| Laevitealliocaris | Gen. et sp. nov | Valid | Yang et al. | Late Carboniferous | Tupo Formation | China | A relative of Tealliocaris. The type species is L. xiaheyanensis. |
| Lessiniamathia | Gen. et sp. nov | Valid | Ceccon & De Angeli | Eocene (Ypresian) | | Italy | A crab belonging to the family Epialtidae. Genus includes new species L. bolcense. |
| Lessinipagurus bericus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A hermit crab belonging to the family Xylopaguridae. |
| Longipaguristes regularis | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A hermit crab belonging to the family Diogenidae. |
| Longodromites aubreyae | Sp. nov | Valid | Schweitzer et al. | Late Jurassic | | Romania | A crab belonging to the family Longodromitidae. |
| Maeandricampus starri | Sp. nov | Valid | Feldmann, Schweitzer & Goedert | Late Oligocene to earliest Miocene | Lincoln Creek Formation | United States | A crab belonging to the family Carcinidae. |
| Mesolambrus bragai | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab belonging to the family Parthenopidae. |
| Occultocaris feckei | Sp. nov | Valid | Winkler | Late Jurassic (Tithonian) | Solnhofen Limestone | Germany | A caridean shrimp. |
| Olicarcinus | Gen. et sp. nov | Valid | Beschin & Checchi | Eocene (Lutetian) | | Italy | A crab belonging to the family Carcinidae. The type species is O. trevisani. |
| Oscacarpilius | Gen. et sp. nov | Valid | Artal & van Bakel | Eocene (Ypresian) | | Spain | A crab belonging to the family Carpiliidae. Genus includes new species O. rotundus. |
| Pachycheles cristatus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A porcelain crab, a species of Pachycheles. |
| Pachycheles multituberculatus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A porcelain crab, a species of Pachycheles. |
| Pachycheles semiornatus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A porcelain crab, a species of Pachycheles. |
| Paguristes michikoae | Sp. nov | Valid | Karasawa & Fudouji | Early Oligocene | Sari Sandstone Member of the Kishima Group | Japan | A species of Paguristes. |
| Paguristes teruakii | Sp. nov | Valid | Karasawa & Fudouji | Early Oligocene | Sari Sandstone Member of the Kishima Group | Japan | A species of Paguristes. |
| Paguristes vallionensis | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A species of Paguristes. |
| Palaemon monsdamarum | Sp. nov | Valid | Pasini & Garassino | Miocene (Messinian) | | Italy | A species of Palaemon. |
| Palaeoarmadillo | Gen. et sp. nov | Valid | Poinar | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | An isopod belonging to the family Armadillidae. Genus includes new species P. microsoma. |
| Palaeolibrinus | Gen. et sp. nov | Valid | Broly in Broly, Serrano-Sánchez & Vega | Early Miocene | La Quinta Formation (Mexican amber) | Mexico | A woodlouse belonging to the family Olibrinidae. The type species is P. spinicornis. |
| Palaeospherarmadillo | Gen. et 2 sp. nov | Valid | Broly in Broly, Serrano-Sánchez & Vega | Early Miocene | Mazantic Shale (Mexican amber) | Mexico | A woodlouse. The type species is P. mazanticus; genus also includes P. rotundus. |
| Palicoides faggioni | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab belonging to the family Palicidae. |
| Panopeus paucicarinatus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab belonging to the family Panopeidae, a species of Panopeus. |
| Paraclythia cernavoda | Sp. nov | Valid | Frantescu et al. | Early Cretaceous (Aptian) | Ramadan Formation | Romania | A lobster. |
| Petrolisthes tuberculatus | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A porcelain crab, a species of Petrolisthes. |
| Pilidromia | Gen. et comb. nov | Valid | Schweitzer et al. | Late Jurassic | | Germany  Romania | A crab belonging to the family Longodromitidae. The type species is "Planoprosopon" thiedeae Schweigert & Koppka (2011). |
| Pithonoton lluismariaorum | Sp. nov | Valid | Ossó et al. | Early Cretaceous (Aptian) | Margas de Forcall Formation | Spain | A crab. |
| Politohepatiscus | Gen. et sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab, a member of the family Aethridae. The type species is P. zorzini. |
| Porcellana elegans | Sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A porcelain crab, a species of Porcellana. |
| Prebranchioplax | Gen. et sp. nov | Valid | Vega et al. | Late Cretaceous (Campanian) | Cerro del Pueblo Formation Parras Shale | Mexico | A crab belonging to the family Mathildellidae. Genus includes new species P. cretacica. |
| Priorhyncha | Gen. et sp. nov | Valid | Alencar et al. | Early Cretaceous (Aptian-Albian) | | Brazil | A member of Dendrobranchiata belonging to the family Solenoceridae. Genus includes new species P. feitosai. |
| Proeryon charbonnieri | Sp. nov | Valid | Audo & Schweigert | Middle Jurassic (Callovian) | La Voulte-sur-Rhône Lagerstätte | France | A member of the family Coleiidae. |
| Prosopon barbulescuae | Sp. nov | Disputed | Schweitzer et al. | Late Jurassic | | Romania | A crab belonging to the family Prosopidae. Klompmaker et al. (2020) considered it to be a junior synonym of Europrosopon aculeatum (von Meyer, 1857). |
| Pseudodromilites arzignanensis | Sp. nov | Valid | De Angeli & Alberti | Eocene (Lutetian) | | Italy | A crab belonging to the family Dromiidae. |
| Pseudopancolus | Gen. et sp. nov | Valid | Heard in Heard, de Lourdes Serrano-Sánchez & Vega | Early Miocene | Mexican amber | Mexico | A member of Tanaidacea belonging to the group Tanaidomorpha. Genus includes new species P. minutus. |
| Rathbunopon tarraconensis | Sp. nov | Valid | Ossó et al. | Early Cretaceous (Aptian) | Margas de Forcall Formation | Spain | A crab. |
| Romaleon franciscae | Sp. nov | Valid | Robin et al. | Miocene | | French Southern and Antarctic Lands (Kerguelen Islands) | A species of Romaleon. |
| Romaniacheiros | Gen. et sp. nov | Valid | Frantescu et al. | Late Jurassic (Kimmeridgian-Tithonian) | | Romania | A member of Glypheoidea belonging to the family Mecochiridae. Genus includes new species R. lophia. |
| Romualdocarcinus | Gen. et sp. nov | Valid | Prado & Luque in Prado et al. | Early Cretaceous (late Aptian–early Albian) | Romualdo Formation | Brazil | A crab belonging to the group Heterotremata, possibly a member of the family Eogeryonidae. The type species is R. salesi. |
| Sakakurapsus | Gen. et sp. nov | Valid | Karasawa | Miocene | Lower Sandstone Member of the Bihoku Group | Japan | A crab belonging to the family Varunidae. The type species is S. kogisorum. |
| Schramocaris clarksoni | Sp. nov | Valid | Clark, Miller & Ross | Carboniferous (Viséan) | | United Kingdom | A eumalacostracan crustacean similar to Tealliocaris and Pseudogalathea. |
| Schramocaris matthewi | Sp. nov | Valid | Clark, Miller & Ross | Carboniferous (Viséan) | | Canada | A eumalacostracan crustacean similar to Tealliocaris and Pseudogalathea. |
| Sume | Gen. et sp. nov | Valid | Saraiva, Pinheiro & Santana | Early Cretaceous (Aptian/Albian) | Romualdo Member | Brazil | A member of the family Luciferidae. Genus includes new species S. marcosi. |
| Tanidromites starzykae | Sp. nov | Valid | Schweitzer et al. | Late Jurassic | | Romania | A crab belonging to the family Tanidromitidae. |
| Tethyranina | Gen. et comb. nov | Valid | Pasini & Garassino | Early Miocene – early Pleistocene | | Italy | A crab belonging to the family Raninidae. The type species is "Ranina" propinqua Ristori (1891). |
| Vegaranina rivasi | Sp. nov | Valid | Arano-Ruiz et al. | Late Cretaceous | | Cuba | A member of the family Raninidae. |
| Zannatoius | Gen. et sp. nov | Valid | Beschin, Busulini & Tessier in Beschin et al. | Eocene (Priabonian) | | Italy | A crab, a member of the family Leucosiidae. The type species is Z. vicetinus. |

#### Ostracods

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Acratia caeracella | Sp. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Acratia maugerii | Sp. nov | Valid | Crasquin, Sciuto & Reitano | Late Triassic (Carnian) | Mufara Formation | Italy | |
| Advenocypris similis | Sp. nov | Valid | Teterina | Pliocene | Beken Formation | Russia | A member of the family Candonidae. |
| Aechmina akumame | Sp. nov | Valid | Stocker et al. | Carboniferous (Moscovian) | Ichinotani Formation | Japan | A member of Podocopa belonging to the order Beyrichiocopida and the family Aechminidae. |
| Aechmina? meidlai | Sp. nov | Valid | Lajblová & Kraft | Ordovician (Katian) | Králův Dvůr Formation | Czech Republic | A member of the family Aechminidae. |
| Alciella irizukii | Sp. nov | Valid | Yasuhara et al. | Eocene | | Madagascar | |
| Alicenula longiformis | Sp. nov | Valid | Leite et al. | Early Cretaceous | Quiricó Formation | Brazil | |
| Alicenula sousaensis | Sp. nov | Valid | Sousa, Carvalho & Ferreira | Early Cretaceous | Sousa Formation | Brazil | |
| Amplocypris qaidamensis | Sp. nov | Valid | Yang et al. | Quaternary | Qaidam Basin | China | A member of the family Cyprididae. |
| "Anchistrocheles" gemmellaroi | Sp. nov | Valid | Crasquin, Sciuto & Reitano | Late Triassic (Carnian) | Mufara Formation | Italy | A member of Podocopa belonging to the family Bairdiidae. Originally tentatively assigned to the genus Anchistrocheles, but subsequently transferred to the genus Histriabairdia by Forel & Grădinaru (2020). |
| Aphelocythere dilgeri | Sp. nov | Valid | Franz, Ebert & Stulpinaite | Middle Jurassic (Aalenian and Bajocian) | Upper Opalinuston Formation | Germany | A member of the family Cytheruridae. |
| Bairdia asgarda | Sp. nov | Valid | Ayress & Gould | Early Cretaceous | Åsgard Formation | North Sea Norwegian Sea | A member of Podocopida belonging to the group Bairdiocopina and the family Bairdiidae. |
| Bairdia liviae | Sp. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Bairdia mandruella | Sp. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Bairdia monostorii | Nom. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Bairdia scaliae | Sp. nov | Valid | Crasquin, Sciuto & Reitano | Late Triassic (Carnian) | Mufara Formation | Italy | |
| Bairdia tagaensis | Sp. nov | Valid | Tanaka in Tanaka et a. | Permian (Cisuralian) | Ryozensan Limestone Formation | Japan | |
| Bairdiacypris ikeyanoriyukii | Sp. nov | Valid | Tanaka in Tanaka et a. | Permian (Cisuralian) | Ryozensan Limestone Formation | Japan | |
| Bairdiacypris sorgunensis | Sp. nov | Valid | Forel in Forel, Ozsvárt & Moix | Late Triassic (Carnian) | | Turkey | A member of the family Bairdiidae. |
| Baltonotella? admirabilis | Sp. nov | Valid | Lajblová & Kraft | Ordovician (Katian) | Králův Dvůr Formation | Czech Republic | A member of the family Aparchitidae. |
| Bektasia yawella | Sp. nov | Valid | Forel in Ketmuangmoon et al. | Middle Triassic (Anisian) | Pha Kan Formation | Thailand | |
| Bolbinella limbata | Sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Mangazeya Formation | Russia | A member of Leperditellocopida belonging to the family Bolliidae. |
| Bythoceratina spinosa | Sp. nov | Valid | Barros & Piovesan in Barros, Piovesan & Agostinho | Late Cretaceous (Maastrichtian) | Gramame Formation | Brazil | A member of Podocopida belonging to the family Bythocytheridae. |
| Cardobairdia tesakovae | Sp. nov | Valid | Franz, Ebert & Stulpinaite | Middle Jurassic (Aalenian) | | Germany | A member of the family Healdiidae. |
| Clithrocytheridea ljubimovae | Sp. nov | Valid | Dykan in Dykan et al. | Paleogene | Boltysh crater | Ukraine | A member of the family Cytherideidae. |
| Clivosolobella | Gen. et sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Ust'-Stolbovaya Formation | Russia | A member of Hollinocopida belonging to the family Egorovellidae. The type species is C. rugula. |
| Collibolbina habeotubercula | Sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Mangazeya Formation | Russia | A member of Hollinocopida belonging to the family Tetradellidae. |
| Crescentilla laciniata | Sp. nov | Valid | Lajblová & Kraft | Ordovician (Katian) | Králův Dvůr Formation | Czech Republic | A member of the family Aechminidae. |
| Cypridea paraibensis | Sp. nov | Valid | Sousa, Carvalho & Ferreira | Early Cretaceous | Sousa Formation | Brazil | |
| Cypridea samesi | Sp. nov | Valid | Choi, Wang & Huh | Early Cretaceous | Jinju Formation | South Korea | |
| Cypridea vianai | Sp. nov | Valid | Sousa, Carvalho & Ferreira | Early Cretaceous | Sousa Formation | Brazil | |
| Cypridea zalanyii | Sp. nov | Valid | Cséfán & Tóth | Early Cretaceous (Albian) | | Hungary | |
| Cyprideis civisi | Sp. nov | | Ruiz, González-Regalado & Abad | Pliocene | | Spain | A member of the family Cytherideidae. |
| Cytherella boltyshevae | Sp. nov | Valid | Dykan in Dykan et al. | Paleogene | Boltysh crater | Ukraine | A member of the family Cytherellidae. |
| Cytherella centrocompressa | Sp. nov | Valid | Barros & Piovesan in Barros, Piovesan & Agostinho | Late Cretaceous (late Maastrichtian) | Gramame Formation | Brazil | A member of the family Cytherellidae. |
| Cytherella paraibensis | Sp. nov | Valid | Barros & Piovesan in Barros, Piovesan & Agostinho | Late Cretaceous (late Maastrichtian) | Gramame Formation | Brazil | A member of the family Cytherellidae. |
| Cytherelloidea baghinensis | Sp. nov | Valid | Khosravi, Vaziri & Arab | Early Cretaceous (Aptian) | | Iran | |
| Cytherelloidea mazarensis | Sp. nov | Valid | Khosravi, Vaziri & Arab | Early Cretaceous (Aptian) | | Iran | |
| Cytherelloidea sirizensis | Sp. nov | Valid | Khosravi, Vaziri & Arab | Early Cretaceous (Aptian) | | Iran | |
| Cytheropterina alacostata | Sp. nov | Valid | Franz, Ebert & Stulpinaite | Middle Jurassic (Aalenian) | Achdorf Formation | Germany | A member of the family Cytheruridae. |
| Darwinula oryzalis | Nom. nov | Valid | Naumcheva | Early Triassic | Vokhma Formation | Russia | A replacement name for Darwinula acuta Mishina (1966). |
| Darwinula vetusta | Nom. nov | Valid | Naumcheva | Permian | | Russia | A replacement name for Darwinula mera Starozhilova (1967). |
| Disulcina (?) complanata | Sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Dolborsa Formation | Russia | A member of Hollinocopida belonging to the family Sylthiidae. |
| Dorsogibbella | Gen. et 3 sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Mangazeya Formation | Russia | A member of Hollinocopida belonging to the family Piretellidae. The type species is D. hippocrepicus; genus also includes new species D. claviformis and D. costaventralis. |
| Easchmidtella gibbosa | Sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Dolborsa Formation | Russia | A member of Leperditellocopida belonging to the family Schmidtellidae. |
| Eucyprinotus qinghaiensis | Sp. nov | Valid | Yang et al. | Quaternary | Qaidam Basin | China | A member of the family Cyprididae. |
| Eucypris lobatoi | Sp. nov | Valid | Bergue, Ramos & Maranhão | Oligocene | Tremembé Formation | Brazil | A member of the family Cyprididae. |
| Eucytherura ventrotuberculata | Sp. nov | Valid | Barros & Piovesan in Barros, Piovesan & Agostinho | Late Cretaceous (Maastrichtian) and Paleocene (Danian) | Gramame Formation | Argentina  Brazil | A member of Podocopida belonging to the family Cytheruridae. |
| Euprimites (Euprimites) kralodvorensis | Sp. nov | Valid | Lajblová & Kraft | Ordovician (Katian) | Králův Dvůr Formation | Czech Republic | A member of the family Tvaerenellidae. |
| Gaindella | Gen. et sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Dolborsa Formation | Russia | A member of Hollinocopida belonging to the family Egorovellidae. The type species is G. signata. |
| Healdia mizuboradanensis | Sp. nov | Valid | Stocker et al. | Carboniferous (Moscovian) | Ichinotani Formation | Japan | A member of Podocopa belonging to the order Podocopida and the family Healdiidae. |
| Hemicypris lomastroi | Sp. nov | Valid | Spadi, Gliozzi & Medici | Piacenzian–Gelasian | Dunarobba Fossil Forest | Italy | |
| Heterocypris subtriangularis | Sp. nov | Valid | Yang et al. | Quaternary | Qaidam Basin | China | A member of the family Cyprididae. |
| Hungarella mahmudiaensis | Sp. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Hungarella poli | Sp. nov | Valid | Chitnarin in Ketmuangmoon et al. | Middle Triassic (Anisian) | Pha Kan Formation | Thailand | |
| Hungaroleberis | Gen. et sp. et comb. nov | Valid | Tóth & Cséfán | Late Permian to Middle Jurassic (Bajocian) | | China  Greece  Hungary | A member of Myodocopa. The type species is H. retiferus; genus also includes "Cypridina" gussevaae Crasquin-Soleau & Baud (1998). |
| ?Infracytheropteron bisulcatum | Sp. nov | Valid | Franz, Ebert & Stulpinaite | Middle Jurassic (Aalenian) | | Germany | A member of the family Cytheruridae. |
| Judahella? montanarii | Sp. nov | Valid | Crasquin, Sciuto & Reitano | Late Triassic (Carnian) | Mufara Formation | Italy | |
| Kellettina noriyukii | Sp. nov | Valid | Tanaka in Tanaka et a. | Permian (Cisuralian) | Ryozensan Limestone Formation | Japan | |
| Kempfina tineriella | Sp. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Kinkelinella (Kinkelinella) geisingensis | Sp. nov | Valid | Franz, Ebert & Stulpinaite | Middle Jurassic (Aalenian) | | Germany | A member of the family Progonocytheridae. |
| Langiella fauthi | Sp. nov | Valid | Barros & Piovesan in Barros, Piovesan & Agostinho | Late Cretaceous (Maastrichtian) | Gramame Formation | Brazil | A member of Podocopida belonging to the family Trachyleberididae. |
| Langtonia abdomorostrata | Sp. nov | Valid | Dykan in Dykan et al. | Paleogene | Boltysh crater | Ukraine | |
| Lenatella arcuata | Sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Mangazeya Formation | Russia | A member of the family Piretellidae. |
| Leviella lampangensis | Sp. nov | Valid | Forel in Ketmuangmoon et al. | Middle Triassic (Anisian) | Pha Kan Formation | Thailand | |
| Liuzhinia antalyaformis | Sp. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Liuzhinia bithynica | Sp. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Liuzhinia edvardgriegi | Sp. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Microcheilinella? contrariella | Sp. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Microcheilinella shigensis | Sp. nov | Valid | Tanaka in Tanaka et a. | Permian (Cisuralian) | Ryozensan Limestone Formation | Japan | |
| Milleratia tungusica | Sp. nov | Valid | Gonta & Kanygin | Ordovician | | Russia | A member of Eridocopida belonging to the family Cryptophillidae. |
| Muellerina eocenica | Sp. nov | Valid | Yasuhara et al. | Eocene | | Madagascar | |
| Neocyprideis polygonoreticulata | Sp. nov | Valid | Yasuhara et al. | Eocene | | Madagascar | |
| Neomonoceratina afroangulosa | Sp. nov | Valid | Yasuhara et al. | Eocene | | Madagascar | |
| Neomonoceratina iwasakii | Sp. nov | Valid | Tanaka in Tanaka et al. | Eocene | Akasaki Formation | Japan | A member of Podocopida belonging to the family Schizocytheridae. |
| Neonesidea potyensis | Sp. nov | Valid | Barros & Piovesan in Barros, Piovesan & Agostinho | Late Cretaceous (Maastrichtian) | Gramame Formation | Brazil | A member of Podocopida belonging to the family Bairdiidae. |
| Neorichterina | Gen. et sp. nov | Valid | Tóth & Cséfán | Early Cretaceous (Albian) | | Brazil  Gabon  Hungary  Israel  Morocco  Switzerland  United Kingdom Pacific Ocean (Mid Pacific Mountains) | A member of Myodocopa belonging to the family Entomozoidae. The type species is N. striata. |
| Neothlipsura khiska | Sp. nov | Valid | Salas et al. | Late Silurian | Tambolar Formation | Argentina | |
| Oliganisus ryozensannensis | Sp. nov | Valid | Tanaka in Tanaka et a. | Permian (Cisuralian) | Ryozensan Limestone Formation | Japan | |
| Paijenborchella amakusensis | Sp. nov | Valid | Tanaka et al. | Eocene | Akasaki Formation | Japan | A member of Podocopida belonging to the family Schizocytheridae. |
| Paijenborchellina madagascarensis | Sp. nov | Valid | Yasuhara et al. | Eocene | | Madagascar | |
| Palaeocypridina goeroegae | Sp. nov | Valid | Tóth & Cséfán | Middle Triassic (Ladinian) | Buchenstein Formation | Hungary | A member of Myodocopa. |
| Paracypris oanaella | Sp. nov | Valid | Forel & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Paralimnocythere turgida | Sp. nov | Valid | Spadi, Gliozzi & Medici | Piacenzian–Gelasian | Dunarobba Fossil Forest | Italy | |
| Parenthatia hanamiloslavensis | Sp. nov | Valid | Lajblová & Kraft | Ordovician (Katian) | Králův Dvůr Formation | Czech Republic | A member of the family Bolliidae. |
| Penthesilenula pintoi | Sp. nov | Valid | Leite et al. | Early Cretaceous | Quiricó Formation | Brazil | |
| Pleurocythere ohmerti | Sp. nov | Valid | Franz, Ebert & Stulpinaite | Middle Jurassic (Aalenian and Bajocian) | | Germany | A member of the family Protocytheridae. |
| Pokornyopsis csurgokutensis | Sp. nov | Valid | Tóth & Cséfán | Early Jurassic (Toarcian) | | Hungary | A member of Myodocopa. |
| Polycope circulosa | Sp. nov | Valid | Franz, Ebert & Stulpinaite | Middle Jurassic (Aalenian) | | Germany | A member of the family Polycopidae. |
| Pontocyprella valhalla | Sp. nov | Valid | Ayress & Gould | Early Cretaceous | Tuxen Formation Valhall Formation | North Sea Norwegian Sea | |
| Potamocypris taubatensis | Sp. nov | Valid | Bergue, Ramos & Maranhão | Oligocene | Tremembé Formation | Brazil | A member of the family Cyprididae. |
| Praeschuleridea concentrica | Sp. nov | Valid | Franz, Ebert & Stulpinaite | Middle Jurassic (Aalenian) | | Germany | A member of the family Schulerideidae. |
| Procytheropteron catena | Sp. nov | Valid | Franz, Ebert & Stulpinaite | Middle Jurassic (Aalenian) | | Germany | A member of the family Cytheruridae. |
| Progonocythere scutula | Sp. nov | Valid | Franz, Ebert & Stulpinaite | Middle Jurassic (Aalenian) | | Germany | A member of the family Progonocytheridae. |
| Protobuntonia punctatum | Sp. nov | Valid | Barros & Piovesan in Barros, Piovesan & Agostinho | Late Cretaceous (late Maastrichtian) and Paleocene (early Danian) | Gramame Formation | Brazil | A member of Podocopida belonging to the family Trachyleberididae. |
| Pseudulrichia lucberkensis | Sp. nov | Valid | Lajblová & Kraft | Ordovician (Katian) | Králův Dvůr Formation | Czech Republic | A member of the family Aechminidae. |
| Pseudulrichia risumata | Sp. nov | Valid | Lajblová & Kraft | Ordovician (Katian) | Králův Dvůr Formation | Czech Republic | A member of the family Aechminidae. |
| Psychrodromus mangnaiensis | Sp. nov | Valid | Yang et al. | Quaternary | Qaidam Basin | China | A member of the family Cyprididae. |
| Pustulobairdia ohmiensis | Sp. nov | Valid | Tanaka in Tanaka et a. | Permian (Cisuralian) | Ryozensan Limestone Formation | Japan | |
| Rectella bublei | Sp. nov | Valid | Lajblová & Kraft | Ordovician (Katian) | Králův Dvůr Formation | Czech Republic | A member of the family Rectellidae. |
| Reigiopsis conicus | Sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Mangazeya Formation | Russia | A member of Hollinocopida belonging to the family Tetradellidae. |
| Reigiopsis tumulus | Sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Mangazeya Formation | Russia | A member of Hollinocopida belonging to the family Tetradellidae. |
| Scutumella gruminosa | Sp. nov | Valid | Gonta & Kanygin | Late Ordovician | Mangazeya Formation | Russia | A member of Leperditellocopida belonging to the family Bolliidae. |
| Spinigerites ostrovites | Sp. nov | Valid | Lajblová & Kraft | Ordovician (Katian) | Králův Dvůr Formation | Czech Republic | A member of the family Spinigeritidae. |
| Spiricopia | Gen. et sp. nov | Valid | Siveter et al. | Silurian | Coalbrookdale Formation | United Kingdom | A member of Myodocopida belonging to the family Cylindroleberididae. The type species is S. aurita. |
| Stigmatobradleya | Gen. et sp. nov | Valid | Yasuhara et al. | Eocene | | Madagascar | Genus includes new species S. hunti. |
| Timiriasevia sanfranciscanensis | Sp. nov | Valid | Leite et al. | Early Cretaceous | Quiricó Formation | Brazil | |
| Trajancypris nanlingqiuensis | Sp. nov | Valid | Yang et al. | Quaternary | Qaidam Basin | China | A member of the family Cyprididae. |
| Triassocypris phakanella | Sp. nov | Valid | Forel in Ketmuangmoon et al. | Middle Triassic (Anisian) | Pha Kan Formation | Thailand | |
| Tyrrhenocythere pulcherrima | Sp. nov | Valid | Sciuto et al. | Miocene (Messinian) to early Pleistocene) | | Italy | A member of Podocopida belonging to the family Hemicytheridae. |
| Uroleberis paranuda | Sp. nov | Valid | Yasuhara et al. | Eocene | | Madagascar | |
| Wangshangkia | Gen. et 2 sp. nov | Valid | Song & Gong | Late Devonian | Gelaohe Formation | China | A member of Podocopida belonging to the superfamily Bairdiocypridoidea and the family Bairdiocyprididae. The type species is W. dushaniensis; genus also includes W. bailouiensis. |
| Warthinia trinoda | Sp. nov | Valid | Lajblová & Kraft | Ordovician (Katian) | Králův Dvůr Formation | Czech Republic | A member of the family Bolliidae. |
| Xestoleberis renemai | Sp. nov | Valid | Yasuhara et al. | Eocene | | Madagascar | |

#### Other crustaceans

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Diestheria deshenglingensis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Diestheria latovata | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Diestheria ovaliformis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Diestheria striaris | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Diestheria xiaoqiaomugouensis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Diestheria yangshugouensis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Eosestheria gracilis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Eosestheria jiuwuensis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Eosestheria lata | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Eosestheria magna | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Eosestheria obliqua | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Eosestheria paucilinearis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Eosestheria shanwanensis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Eosestheria shibapanensiss | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Eosestheria yangshugouensiss | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Euestheria kozuri | Sp. nov | Valid | Geyer & Kelber | Late Triassic (Carnian) | Hassberge Formation | Germany | A clam shrimp. |
| Gregoriusella striatula | Sp. nov | Valid | Geyer & Kelber | Late Triassic (Carnian) | Hassberge Formation | Germany | A clam shrimp. |
| Hemicycloleaia ejinaqiensis | Sp. nov | | Niu in Lu et al. | Permian | | China | A diplostracan belonging to the family Leaiidae. |
| Hexaminius venerai | Sp. nov | Valid | Kočí et al. | Middle Eocene | La Meseta Formation | Antarctica (Seymour Island) | A barnacle. |
| Platyestheria | Gen. et comb. nov | Valid | Bittencourt et al. | Early Cretaceous | Quiricó Formation | Brazil | A clam shrimp; a new genus for "Pseudestheria" abaetensis Cardoso (1971). |
| Polygrapta neimengguensis | Sp. nov | | Niu in Lu et al. | Permian | | China | A clam shrimp belonging to the family Euestheriidae. |
| Skuinocyclus | Gen. et sp. nov | Valid | Mychko & Alekseev | Permian (Cisuralian) | | Russia | A member of Cyclida. Genus includes new species S. juliae. |
| Undulatesta | Gen. et sp. nov | Valid | Gueriau, Rabet & Du Tien Hat | Devonian (late Famennian) | | Belgium | A clam shrimp belonging to the group Vertexioidea. The type species is U. bounonensis. |
| Uralocyclus | Gen. et comb. nov | Valid | Mychko & Alekseev | Permian (Asselian) | | Russia | A member of Cyclida. Genus includes "Cyclus" miloradovitchi Kramarenko (1961). |
| Yanjiestheria anchungouensis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Yanjiestheria deshenglingensis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Yanjiestheria rotunda | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Yanjiestheria shanwanensis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |
| Yanjiestheria xiaoqiaomugouensis | Sp. nov | | Niu in Niu & Xin | Cretaceous | | China | A clam shrimp. |

## Trilobites
### Research

* Frontal auxiliary impressions (muscle scars on the glabella) are described in Mesolenellus hyperboreus from Cambrian Stage 4 strata of North Greenland by Lerosey-Aubril & Peel (2018), providing new information on the evolution of a pouch-like digestive organ with powerful extrinsic muscles (i.e. a crop) in trilobites.
* A study on complete moulted exoskeletons of Estaingia bilobata and Redlichia takooensis from the Cambrian Emu Bay Shale (Australia), and their implications for inferring the course of moulting in trilobites, is published by Drage et al. (2018).
* A study assessing the morphological differences within and among three populations of Oryctocephalus indicus from the United States, Siberia and China, using a new method of analysing small morphological features, is published by Esteve et al. (2018).
* A study on early post-embryonic developmental stages of the Cambrian trilobite Ellipsostrenua granulosa is published by Laibl, Cederström & Ahlberg (2018).
* A study on the ontogeny of the co-occurring shumardiid trilobites Akoldinioidia latus and Koldinioidia choii from the middle Furongian Hwajeol Formation (South Korea) is published by Park (2018).
* Remains of the digestive system of a specimen of the bathycheilid species Prionocheilus vokovicensis from the Ordovician Šárka Formation (Czech Republic) are described by Fatka & Budil (2018).
* A study on the postembryonic development of Dalmanitina, based on a large sample of specimens from the Upper Ordovician Prague Basin, is published by Drage, Laibl & Budil (2018).
* A large and almost complete dorsal exoskeleton of a trilobite referred to the species Dipleura dekayi is described from the Devonian Floresta Formation (Colombia) by Carvalho (2018).
* A study on the phylogenetic relationships of species belonging to the genus Metacryphaeus is published by Carbonaro et al. (2018), who also perform a palaeobiogeographic analysis for the distribution of the genus.

### New taxa

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Adelogonus prichardi | Sp. nov | Valid | Smith, Paterson & Brock | Cambrian | Goyder Formation | Australia | |
| Amphiroaspis | Gen. et comb. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | A member of the family Phillipsiidae belonging to the subfamily Weaniinae. The type species is "Carbonocoryphe (Winterbergia)" amphiro Hahn, Hahn & Müller (1996); genus also includes "Carbonocoryphe (Winterbergia)" sporada Hahn, Hahn & Müller (2007). |
| Asaphellus albae | Sp. nov | Valid | Meroi Arcerito et al. | Ordovician (Tremadocian) | Santa Rosita Formation | Argentina | |
| Austerops salamandaroides | Sp. nov | Valid | Crônier et al. | Devonian | Chefar el Ahmar Formation | Algeria | |
| Bailiella sepulcra | Sp. nov | Valid | Álvaro & Vizcaïno | Cambrian (Furongian) | Bailiella Formation | Morocco | A member of the family Conocoryphidae. |
| Belgibole kalypso | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Bradocryphaeus echinatus | Sp. nov | Valid | Van Viersen & Vanherle | Devonian (Frasnian) | Moulin Liénaux Formation | Belgium | A member of the family Acastidae. |
| Bradocryphaeus laomedeia | Sp. nov | Valid | Van Viersen & Vanherle | Devonian (Frasnian) | Grands Breux Formation | Belgium | A member of the family Acastidae. |
| Bradocryphaeus neptuni hottonensis | Subsp. nov | Valid | Van Viersen & Vanherle | Devonian (Frasnian) | Grands Breux Formation | Belgium | A member of the family Acastidae. |
| Brevibole archinalae | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Brevibole halszkae | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Buchiproetus? exconcha | Sp. nov | Valid | Flick | Devonian | | Germany | A member of Proetida belonging to the family Tropidocoryphidae. |
| Buenellus chilhoweensis | Sp. nov | Valid | Webster & Hageman | Cambrian Series 2 (Montezuman) | Murray Shale | United States | |
| Chlupacula (Chiides) pandora | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Cornuproetus pusulosus | Sp. nov | Valid | Feist & Belka | Devonian (Emsian) | | Morocco | |
| Cornuproetus? runzheimeri | Sp. nov | Valid | Flick | Devonian | | Germany | A member of Proetida belonging to the family Tropidocoryphidae. |
| Crassibole ate | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Crassibole? walliseri | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Cyphaspis koimeterionensis | Sp. nov | Valid | Van Viersen & Vanherle | Devonian (Frasnian) | Grands Breux Formation | Belgium | A member of the family Aulacopleuridae. |
| Cyrtoproetus eremus | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Cyrtoproetus galapagos | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Cyrtoproetus pegasus | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Deltapliomera | Gen. et 3 sp. et comb. nov | Valid | McAdams, Adrain & Karim | Early Ordovician | | United States | The type species is D. humphriesi; genus also includes new species D. eppersoni and D. inglei, as well as D. heimbergi. |
| Diacoryphe (Diacoryphe) phoenix | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Ditomopyge (Carniphillipsia) mosquensis | Sp. nov | Valid | Mychko & Alekseev | Carboniferous (Gzhelian) | | Russia | |
| Duyunaspis jianheensis | Sp. nov | Valid | Chen et al. | Cambrian Stage 4 | | China | An oryctocephalid trilobite. |
| Dysplanus acutigenia putilovoensis | Subsp. nov | Valid | Krylov | Ordovician (Dapingian) | | Russia | |
| Erdbachaspis | Gen. et comb. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | A member of the family Phillipsiidae belonging to the subfamily Archegoninae. The type species is "Phillipsia" granulifera Holzapfel (1889); genus also includes E. aithyia (Hahn, Hahn & Müller, 2001), E. bathapoikos (Hahn, Hahn & Müller, 1998) and possibly "Proliobole" krambergensis Hahn, Hahn & Müller (1996). |
| Harpes hamarlaghdadensis | Sp. nov | Valid | Crônier et al. | Devonian (Emsian) | | Morocco | A member of Harpetida belonging to the family Harpetidae. Subsequently transferred to the genus Pinnuloharpes by Johnson (2024). |
| Hebeia stewarti | Sp. nov | Valid | Smith, Paterson & Brock | Cambrian | Goyder Formation | Australia | |
| Ibexaspis coadyi | Sp. nov | Valid | McAdams, Adrain & Karim | Early Ordovician | | United States | |
| Ibexaspis leuppi | Sp. nov | Valid | McAdams, Adrain & Karim | Early Ordovician | | United States | |
| Ibexaspis rupauli | Sp. nov | Valid | McAdams, Adrain & Karim | Early Ordovician | | United States | |
| Latibole gamma | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Latibole parapaprothae | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Latibole pleon | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Leonaspis bassei | Sp. nov | Valid | Alberti | Devonian (Emsian) | | Germany | |
| Liebsteinella | Gen. et comb. et 2 sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | A member of the subfamily Cystispininae. The type species is "Tawstockia" martini Müller (2004); genus also includes new species L. sauerlandica and L. weberi. |
| Liobole (Liobole) meyeri | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Liobole (Liobole) io | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Liobole (Panibole) emrichterae | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Liobole (Panibole) groeningae | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Liobole (Panibole) isis | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Liobole (Panibole) paraglabroides | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Liobole (Panibole) subaequalis hschmidti | Subsp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Lioharpes wendti | Sp. nov | Valid | Feist & Belka | Devonian (Emsian) | | Morocco | |
| Liostracina joyceae | Sp. nov | Valid | Smith, Paterson & Brock | Cambrian | Goyder Formation | Australia | |
| Longaspis | Gen. et sp. nov | Valid | Peng et al. | Cambrian Stage 4 | Balang Formation | China | A member of the family Oryctocephalidae. Genus includes new species L. paiwuensis. |
| Luciaspis | Gen. et sp. nov | Valid | Álvaro et al. | Cambrian | Huérmeda Formation | Spain | A saukiandid trilobite. Genus includes new species L. matiasi. |
| Magreanops | Gen. et 2 sp. nov | Valid | Van Viersen & Vanherle | Devonian (Frasnian) | Bovesse Formation Moulin Liénaux Formation | Belgium | A member of the family Phacopidae. The type species is M. renateae; genus also includes M. monachus. |
| Maladioidella? destombesi | Sp. nov | Valid | Álvaro & Vizcaïno | Cambrian (Furongian) | Bailiella Formation | Morocco | A member of the family Idahoiidae. |
| Millardaspis | Gen. et 2 sp. nov | Valid | McAdams, Adrain & Karim | Early Ordovician | | United States | The type species is M. milsteadi; genus also includes M. knoxi. |
| Morocops davidbrutoni | Sp. nov | Valid | Crônier et al. | Devonian (Emsian) | | Morocco | |
| Neoillaenus | Gen. et comb. nov | Valid | Krylov | Ordovician (Darriwilian–Katian) | | Estonia  Russia  Sweden | The type species is "Illaenus" excellens Holm (1886); genus also includes Neoillaenus atavus (Eichwald, 1857), N. oblongatus (Angelin, 1854), N. kukersianus (Holm, 1886), N. itferensis (Holm, 1886) and N. praecurriens (Jaanusson, 1957). |
| Omegops tilabadensis | Sp. nov | Valid | Ghobadi Pour et al. | Devonian (Famennian) | Khoshyeilaq Formation | Iran | A member of the family Phacopidae. |
| Onaraspis garciae | Sp. nov | Valid | Álvaro et al. | Cambrian | Huérmeda Formation | Spain | A saukiandid trilobite. |
| Panderia balashovae | Sp. nov | Valid | Krylov | Early Ordovician | | Russia | |
| Panderia koshkarovi | Sp. nov | Valid | Krylov | Ordovician (Darriwilian) | | Russia | |
| Paulaspis | Gen. et sp. nov | Valid | Álvaro et al. | Cambrian | Huérmeda Formation | Spain | A saukiandid trilobite. Genus includes new species P. tiergaensis. |
| Phacops ouarouroutensis | Sp. nov | Valid | Crônier et al. | Devonian | Chefar el Ahmar Formation | Algeria | |
| Phaetonellus dillensis | Sp. nov | Valid | Basse & Müller | Devonian | | Germany | |
| Phaetonellus greifensteinensis | Sp. nov | Valid | Basse & Müller | Devonian | | Germany | |
| Phaetonellus heckelmanni | Sp. nov | Valid | Basse & Müller | Devonian | | Germany | |
| Phaetonellus kimi | Sp. nov | Valid | Basse & Müller | Devonian | | Germany | |
| Phaetonellus martinius | Sp. nov | Valid | Basse & Müller | Devonian | Leun Limestone | Germany | |
| Perliproetus africanus | Sp. nov | Valid | Feist & Weyer | Devonian (Famennian) | | Morocco | |
| Perliproetus kallenhardtensis | Sp. nov | Valid | Feist & Weyer | Devonian (Famennian) | | Germany | |
| Pterocoryphe platymarginata | Sp. nov | Valid | Van Viersen & Vanherle | Devonian (Frasnian) | Champ Broquet Formation | Belgium | A member of the family Proetidae. |
| Quadratispina excelsa | Sp. nov | Valid | Van Viersen & Vanherle | Devonian (Frasnian) | Bovesse Formation | Belgium | A member of the family Acastidae. |
| Redlichia isuelaensis | Sp. nov | Valid | Álvaro et al. | Cambrian | Huérmeda Formation | Spain | |
| Spasskyproetus | Gen. et comb. nov | Valid | Basse & Müller | Devonian (Emsian) | | Russia | A new genus for "Phaetonellus" bondarevi Spassky (1989). |
| Spatulata (Spatulata?) pachycraspedata | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Spatulata (Spatulata) tilsleyi | Sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Stenopareia kossovae | Sp. nov | Valid | Krylov | Ordovician (Katian) | | Russia | |
| Syspacephalus mccollumorum | Sp. nov | Valid | Sundberg | Cambrian | Emigrant Formation | United States | A member of Ptychopariida belonging to the group Ptychopariacea. |
| Tawstockia longispina germanica | Subsp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | |
| Toxophacops (Atopophacops) fujiwara | Sp. nov | Valid | Stocker et al. | Devonian (probably Givetian) | Naidaijin Formation | Japan | |
| Trephina | Gen. et sp. nov | Valid | Smith, Paterson & Brock | Cambrian | Goyder Formation | Australia | Genus includes new species T. ranfordi. |
| Tuleaspis | Gen. et sp. nov | Valid | McAdams, Adrain & Karim | Early Ordovician | | United States | The type species is T. jeneki. |
| Xylomelon | Gen. et comb. et sp. nov | Valid | Müller & Hahn | Carboniferous (Mississippian) | | Germany | A member of the subfamily Cystispininae. The type species is "Xenadoche" kalliroe Hahn, Hahn & Müller (1996); genus also includes X. agenor (Hahn, Hahn & Müller, 2000), X. elissa (Hahn, Hahn & Müller, 2000) and X. medusa (Hahn, Hahn & Müller, 1999), as well as new species X. xenios. |

## Other arthropods
### Research

* A study on the external and internal anatomy and possible lifestyle of Waptia fieldensis, based on revision of all available specimens available from the repositories in the National Museum of Natural History and the Royal Ontario Museum, is published by Vannier et al. (2018).
* A study on the lateral tail flexibility in the eurypterid Slimonia acuminata published by Persons & Acorn (2017) is criticized by Lamsdell, Marshall & Briggs (2018); Persons (2018) defends his original conclusions on the basis of a study of additional eurypterid specimens.
* A study on the microstructure of gnathobasic spines on the coxa of extant Atlantic horseshoe crab, Silurian eurypterid Eurypterus tetragonophthalmus and Cambrian artiopodan Sidneyia inexpectans is published by Bicknell et al. (2018).
* A study on the mechanical performance of the feeding appendages of Sidneyia inexpectans, based on comparisons with extant Atlantic horseshoe crab, is published by Bicknell et al. (2018).
* Bicknell, Pates & Botton (2018) report abnormalities in specimens of extant (Limulus polyphemus, Tachypleus tridentatus) and fossil (Euproops danae, Mesolimulus walchi) horseshoe crabs, and compare injuries to horseshoe crab cephalothoraces to those affecting Cambrian trilobites to explore the possible timing of the injuries.
* Sánchez-García et al. (2018) report the presence of probable male clasping organs for courtship and securing the female during copulation in the springtail Pseudosminthurides stoechus and an aggregation of up to 45 specimens of the springtail Proisotoma communis from the Cretaceous amber from Spain.
* Closely associated arthropleurid trackways, interpreted as evidence of arthropleurid mating behaviour, are described from the Lower Carboniferous of Fife (Scotland, United Kingdom) by Whyte (2018).
* Two immature specimens of polyxenidan millipedes are described from the Eocene Bitterfeld amber (Germany) by Haug et al. (2018).
* First known millipede fossil material from Central America (disarticulated trunk segments of members of the genus Nyssodesmus from the late Pleistocene of Costa Rica) is described by Laurito & Valerio (2018).
* Insect resting traces and arthropod trackways are described from the Eocene Mount Wawel Formation (King George Island, Antarctica) by Uchman, Gaździcki & Błażejowski (2018), who name a new ichnofamily Protichnidae and a new ichnospecies Glaciichnium australis.
* Revision of blood-feeding arthropods from the Paleogene Baltic amber is published by Pielowska, Sontag & Szadziewski (2018).

### New taxa

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Adelophthalmus khakassicus | Sp. nov | Valid | Shpinev & Filimonov | Devonian (Givetian) | | Russia | An eurypterid. |
| Alutella siku | Sp. nov | Valid | Peel & Willman | Cambrian Series 2 | Buen Formation | Greenland | A member of Bradoriida. |
| Concavicaris viktoryni | Sp. nov | Valid | Rak, Broda & Kumpan | Carboniferous | | Czech Republic | A member of Thylacocephala (a group of arthropods of uncertain phylogenetic placement, possibly crustaceans). Originally described as a species of Concavicaris; Broda, Rak & Hegna (2020) made it the type species of a separate genus Paraconcavicaris. |
| Eodiscus coloholcus | Sp. nov | Valid | Westrop, Broda & Dengler | Cambrian | Shallow Bay Formation | Canada | A member of Agnostida belonging to the family Eodiscidae. |
| Eodiscus confossus | Sp. nov | Valid | Westrop, Broda & Dengler | Cambrian | Manuels River Formation | Canada | A member of Agnostida belonging to the family Eodiscidae. |
| Eodiscus tuberculus | Sp. nov | Valid | Westrop, Broda & Dengler | Cambrian | Manuels River Formation | Canada | A member of Agnostida belonging to the family Eodiscidae. |
| Gogglops | Gen. et sp. nov | Valid | Siveter et al. | Ordovician | | China | A member of Aglaspidida. Genus includes new species G. ensifer. |
| Isoxys globulus | Sp. nov | Valid | Liu et al. | Cambrian Stage 4 | Balang Formation | China | |
| Isoxys jianheensis | Sp. nov | Valid | Liu et al. | Cambrian Stage 4 | Balang Formation | China | |
| Messorocaris | Gen. et sp. nov | Valid | Lerosey-Aubril & Skabelund | Cambrian (Drumian) | Wheeler Formation | United States | A possible relative of Sanctacaris. The type species is M. magna. |
| Misszhouia canadensis | Sp. nov | Valid | Mayers, Aria & Caron | Wuliuan | Burgess Shale | Canada | A member of the family Naraoiidae. |
| Naraoia arcana | Sp. nov | Valid | Mayers, Aria & Caron | Wuliuan | Burgess Shale | Canada | A member of the family Naraoiidae. |
| Naraoia magna | Sp. nov | Valid | Mayers, Aria & Caron | Wuliuan | Burgess Shale | Canada | A member of the family Naraoiidae. |
| Pagetia aspinosa | Sp. nov | Valid | Sundberg | Cambrian | Emigrant Formation | United States | |
| Pagetia claytonensis | Sp. nov | Valid | Sundberg | Cambrian | Emigrant Formation | United States | |
| Permocrassacus | Gen. et sp. nov | Valid | Khramov et al. | Permian (Kungurian) | Koshelevka Formation | Russia | A member of Scolopendromorpha of uncertain phylogenetic placement. The type species is P. novokshonovi. |
| Permocryptops | Gen. et sp. nov | Valid | Khramov et al. | Late Permian | Poldarsa Formation | Russia | A member of Scolopendromorpha of uncertain phylogenetic placement. The type species is P. shelleyi. |
| Sinosoma | Gen. et sp. nov | Valid | Huang et al. | Middle Triassic | | China | A helminthomorph millipede sharing a number of characters with nematophorans. Genus includes new species S. luopingense. |
| Soligorskopterus | Gen. et sp. nov | Valid | Plax et al. | Devonian (Famennian) | Soligorsk Formation | Belarus | A eurypterid. Genus includes new species S. tchepeliensis. |
| Symphylella patrickmuelleri | Sp. nov | Valid | Moritz & Wesener | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A member of Symphyla belonging to the family Scolopendrellidae. |
| Woodesmus | Gen. et sp. nov | Valid | Ross, Edgecombe & Clark in Ross et al. | Carboniferous (Tournaisian) | Ballagan Formation | United Kingdom | A millipede belonging to the group Archipolypoda, assigned to the new family Woodesmidae. Genus includes new species W. sheari. |
| Xiphosuroides | Gen. et sp. nov | Valid | Shpinev & Vasilenko | Carboniferous | Sarskaya Formation | Russia | Probably a xiphosuran (order Xiphosura) belonging to the suborder Xiphosurida and the infraorder Belinurina. Genus includes new species X. khakassicus. |