# Planus

Planus is a surname of French origin. People with that name include:
* Marc Planus (born 1982), French footballer
* Pierre Planus (born 1979), French footballer
Planus is a Latin adjective meaning "flat" or "plain". It is part of the binomial name of several species, and of some other combination terms.

## In biology

* Agrypnus planus, a species of click beetle in the genus Agrypnus
* Aneflus planus, a species of beetle in the family Cerambycidae
* Argopatagus planus, a species of sea urchin of the family Macropneustidae
* Blissus planus, a species of true bug in the genus Blissus in the family Blissidae
* Botrylloides planus, a synonym of Botryllus planus
* Botryllus planus, a species of colonial ascidian tunicate in the genus Botryllus in the family Styelidae
* Brachys planus, a species of beetle in the genus Brachys in the family Buprestidae
* Bransatoglis planus, an extinct species of dormouse
* Brochocoleus planus, a species of beetle in the genus Brochocoleus in the family Ommatidae
* Callionymus planus, a species of dragonet native to the shallow Pacific waters off southern Japan
* Camponotus planus, a species of carpenter ant; see List of Camponotus species
* Canthyporus planus, a species of beetle in the genus Canthyporus in the family Dytiscidae
* Carabus perrini planus, a subspecies of beetle in the family Carabidae
* Carabus planus, a synonym of Pheropsophus aequinoctialis, a ground beetle
* Caracara planus, the crested caracara (also known as the carancho), a bird of prey in the family Falconidae
* Catogenus planus, a species of beetle in the genus Catogenus in the family Passandridae
* Cheliferoides planus, a species of spider in the genus Cheliferoides
* Cleptomartus planus, a synonym of Anthracomartus hindi, an extinct species of arachnid in the genus Anthracomartus in the family Anthracomartidae
* Coccophagus planus, a species of chalcid wasp in the genus Coccophagus
* Copodus planus, an extinct species of cartilaginous fish; see List of prehistoric cartilaginous fish genera
* Corax planus, an extinct species of shark in Corax (genus)
* Craspedites planus, an extinct species of ammonoid cephalopod in the genus Craspedites
* Dermestes planus, a species of beetle in the genus Dermestes in the family Dermestidae
* Dicynodon planus, a synonym of Oudenodon bainii, an extinct dicynodont in the genus Oudenodon
* Distichus planus, a species of beetle in the genus Distichus in the family Carabidae
* Epicadus planus, a species of spider in the genus Epicadus in the family Thomisidae; see List of Thomisidae species
* Eucastor planus, an extinct species of beaver found in the Hawthorn Group
* Ferganosuchus planus, the type species of Ferganosuchus, an extinct genus of gavialid crocodilian
* Gonicoelus planus, a species of beetle in the genus Gonicoelus in the family Biphyllidae
* Grynobius planus, a species of beetle in the family Anobiidae
* Heteroscyphus planus, a species of Marchantiophyta (liverwort)
* Hoplobunus planus, a species of harvestman in the family Stygnopsidae
* Hyalodiscus planus, a species of diatom in the genus Hyalodiscus
* Hydroporus planus, a species of water beetle in the genus Hydroporus
* Ischyodus planus, an extinct species of cartilaginous fish in the genus Ischyodus
* Isurus planus, also known as the hook-tooth mako, an extinct mako shark that lived during the Miocene epoch
* Larinus planus, a species of true weevil
* Leptodius planus, a species of crab in the genus Leptodius in the family Xanthidae
* Leptotrachelus planus, a species in the genus Leptotrachelus (beetle) in the family Carabidae
* Lionychus planus, a species of beetle in the genus Lionychus in the family Carabidae
* Metacyclops planus, a species of copepod crustacean in the genus Metacyclops in the family Cyclopidae
* Microcosmus planus, a species of Microcosmus, a genus of tunicates in the family Pyuridae
* Oesyperus planus, a species of beetle in the genus Oesyperus in the family Carabidae
* Pachyscelus planus, a species of beetle in the genus Pachyscelus in the family Buprestidae
* Palaeospheniscus planus, incorrect name for the extinct species of penguin Palaeospheniscus bergi
* Pandanus planus, a synonym of Pandanus tectorius, a species of screwpine
* Penestomus planus, a species of spider in the genus Penestomus
* Philodromus planus, a species of philodromid crab spider in the genus Philodromus in the family Philodromidae; see List of Philodromidae species
* Philophlaeus planus, a species of beetle in the genus Philophlaeus in the family Carabidae
* Polydesmus planus, a species of millipede in the genus Polydesmus
* Protorabus planus, a species of beetle in the subfamily Protorabinae in the family Carabidae
* Psellonus planus, a species of spider in the genus Psellonus in the family Philodromidae; see List of spiders of India
* Pseudaspidites planus, an extinct species of mollusc in the genus Pseudaspidites; see 2012 in molluscan paleontology
* Pseudoparasitus planus, a species of mite in the genus Pseudoparasitus
* Pseudospheniscus planus, incorrect name for the extinct species of penguin Palaeospheniscus bergi
* Pterostichus planus, a species of ground beetle in the genus Pterostichus
* Pyrnus planus, a species of spider in the genus Pyrnus in the family Trochanteriidae; see List of Trochanteriidae species
* Rhipicephalus planus, a species of tick in the genus Rhipicephalus in the family Ixodidae
* Senoculus planus, a species of spider in the genus Senoculus in the family Senoculidae
* Sigaretornus planus, a species in the genus Tornus (gastropod)
* Smerinthus planus, The oriental eyed hawkmoth, a moth of the family Sphingidae
* Sphenodus planus, an extinct species of shark in the genus Sphenodus in the family Orthacodontidae
* Styloniscus planus, a species of woodlouse in the genus Styloniscus
* Syngonanthus planus, a species of plant in the genus Syngonanthus in the family Eriocaulaceae
* Tornus planus, a synonym of Sigaretornus planus
* Trachelas planus, a species of spider in the genus Trachelas in the family Trachelidae; see List of Trachelidae species
* Trochus planus, a synonym of Bembicium nanum, a species of sea snail
* Vetustodermis planus, a soft-bodied middle Cambrian animal, a species in the genus Vetustovermis
* Wilcoxius planus, a species of robber fly (or, assassin fly) in the genus Wilcoxius in the family Asilidae; see List of Asilidae species: W

## Other uses

* Cantus planus, Latin for plainsong (or, plainchant), a body of chants used in the liturgies of the Western Church
* Lichen planus, a disease of the skin and/or mucous membranes that resembles lichen
* Pes planus, a medical term for flat feet (or, fallen arches), a postural deformity in which the arches of the foot collapse