Munidopsis similis
Creators: name: Rodríguez-Flores, Paula C.
name: Seid, Charlotte A.
name: Rouse, Greg W.
name: Giribet, Gonzalo
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Munidopsidae
Munidopsis
Munidopsis similis

description: <i>Munidopsis similis</i> Smith, 1885 (Fig. 8 <i>e</i>, <i>f</i>, 18 <i>a–f</i>.) <i>Munidopsis similis</i> Smith, 1885 <i>Munidopsis asiatica</i> Marin, 2020, <b>syn. nov.</b> Material examined <i>Holotype</i>. USA: Nantucket Shoals, leg. United States Fish Commission, Albatross R/V, Stn 2192, 5.viii.1884, 39.77500°N, 70.24580°W, 1939 m, 1 ov. F 16.7 mm (USNM 8255). <i>Non-type specimens</i>. USA: Gay Head–Bermuda transect, Atlantic Ocean, leg. R/V <i>Chain</i> 088, Howard L. Sanders, Stn 210A, 2.ii.1969, 39.716644°N, 70.766679°W, 2024 to 2064 m, 1 M 17.5 mm (MCZ IZ-81478). — USA: Hudson Canyon, leg. R/V <i>Knorr</i> 35, Stn 326, 18.xi.1973, 39.200000°N, 71.783333°W, 2288 to 2297 m: 3 M 12.3–22.1 mm, 1 ov. F 18.3 mm, 3 F 12.1–17.9 mm (MCZ IZ-127820). — USA: Hudson Canyon, Atlantic, leg. R/V <i>Knorr</i> 35, Stn 325, 18.xi.1973, 39.221611°N, 71.890043°W, 1919 to 1974 m: 1 M 14.5 mm (MCZ IZ-81527). — USA: rise off New England, Atlantic, leg. R/V <i>Atlantis II</i> 086, Stn 432, 41′ Gulf of Mexico shrimp trawl, 19.iii.1975, 39.52000°N, 70.33333°W, 2450 to 2350 m, 1 M 20.4 mm, 1 F 12.3 mm broken (MCZ IZ-39189). — USA: Atlantic Ocean, leg. R/V <i>Chain</i> 124, Stn 501, 4.vii.1975, 38.33666°N, 70.21833°W, 3287 to 3314 m: 1 M broken (MCZ IZ-81526). USA: West Cortes Bank, California, leg. R/V <i>Atlantis II</i>, HOV <i>Alvin</i> dive 1508, cruise AT112, Leg 19, Stn MEA 85-5, 19.i.1985, 32.21823°N 119.25998°W, 1538–1678 m, 1 ov. F 12.1 mm (CAS-IZ 190355). — USA: San Diego Trough, off California, leg. Lisa Levin, Larry Lovell and students, R/V <i>Robert Gordon Sproul</i>, otter trawl, 2.x.2005, 32.60000°N, 117.50830°W, 1215 m: 1 M 11.2 mm (SIO-BIC C10923). — USA: San Diego Trough, off California, leg. Lisa Levin and students, R/V <i>New Horizon</i>, otter trawl, 31.x.2009, 32.59600°N, 117.48300°W, 1200 m: 1 not measured (SIO-BIC C11171). — USA: California, leg. E/V <i>Nautilus</i>, ROV Hercules dive H1829, Stn NA123-015-02-B-MCZ, 17.x.2020, 34.87917°N, 121.74157°W, 1295 m: 1 F 12.1 mm (MCZ IZ-162084). COSTA RICA: Mound Jaguar, leg. Greg Rouse, Avery Hiley, R/V <i>Falkor</i>, ROV <i>SuBastian</i> dive S0230 S3, 25.i.2019, 9.65882°N, 85.88289°W, 1895 m: 1 M 5.8 mm (SIO-BIC C13964). Diagnosis Carapace with numerous short scales each with long, stiff setae, laterally with 3–4 spines, cervical grooves distinct. Rostral spine triangular, slender, often dorsally carinated, lateral margin often serrated. Pair of epigastric spines, often with additional small spines. Frontal margins slightly oblique. Orbit not distinctly excavated; outer orbital angle produced into a strong antennal spine. Anterolateral spine of carapace strong. Branchial margin with 3–4 spines. Abdominal somites with transverse ridge, unarmed. Telson divided into 10 plates. Sternite 3 moderately broad, anterolateral angles produced, sternite 4 subtriangular. Eyes fixed, armed with mesial and lateral spines, mesial larger, epistomial spine absent. Article 1 of peduncle with well developed subequal dorsolateral and distolateral spines. Article 1 of antenna with distomesial spines and distolateral spines. Mxp3 merus as long as ischium, subrhomboidal in lateral view. P1 slender, elongate, spinose, fixed finger with denticulate carina on distolateral margin. P2 not reaching end of P1. P2–4 long and slender; dactyli moderately slender, curving, flexor margin with teeth along entire margin decreasing proximally. Epipods absent from all pereopods. Colouration Carapace, abdomen, eyes and pereopods whitish. Distribution Northwest Atlantic Ocean, Bering Sea and Northeast Pacific, including Costa Rica, from 1390- to 3314-m depth. Genetic data <i>COI</i>, <i>16S</i> rRNA and <i>28S</i> rRNA. Remarks <i>Munidopsis similis</i> was described from southern New England and recorded from the Middle Atlantic Bight, West of Iceland and the Gulf of Mexico (Smith 1885; Hansen 1908; Wenner 1982; Coykendall <i>et al</i>. 2017). Marin (2020) described a new taxon, <i>M. asiatica</i>, from the Bering Sea, reported as morphologically and genetically very similar to <i>M. similis</i> (see Marin 2020). We discovered new records of <i>M. similis</i> for the Northeast Pacific (USA and Costa Rica). Our analyses demonstrate a lack of genetic structure for <i>COI</i> among the Atlantic and East Pacific populations of <i>M. similis</i>, including the Bering Sea population corresponding to <i>M. asiatica</i>, therefore there is no molecular evidence for considering these as two separate taxa (Fig. 2, 4 <i>b</i>). We found morphological variation at the individual level among and within the Atlantic and East Pacific populations in the relative width of the rostrum in relation to length, the presence or absence of a dorsal carina and the presence or absence of small additional spines on the epigastric and hepatic dorsal carapace (see Supplementary Fig. S8). Variations within these characters were considered to be morphological differences between both species (Marin 2020). However, when several specimens of different populations are examined, this variation becomes intraspecific. Therefore, due to the lack of morphological and molecular support, we propose <i>M. asiatica</i> as a junior synonym of <i>M. similis</i>.
description: Published as part of <i>Rodríguez-Flores, Paula C., Seid, Charlotte A., Rouse, Greg W. &amp; Giribet, Gonzalo, 2023, Cosmopolitan abyssal lineages? A systematic study of East Pacific deep-sea squat lobsters (Decapoda: Galatheoidea: Munidopsidae), pp. 14-60 in Invertebrate Systematics 37 (1)</i> on pages 47-48, DOI: 10.1071/is22030, http://zenodo.org/record/7534735
description: {"references": ["Smith SI (1885) On some new or little known decapod Crustacea, from recent Fish Commission dredgings off the east coast of the United States. Proceedings of the United States National Museum 7, 493 - 511. doi: 10.5479 / si. 00963801.455.493", "Marin I (2020) Northern unicorns of the depths: diversity of the genus Munidopsis Whiteaves, 1874 (Decapoda: Anomura: Munidopsidae) in the northwestern Pacific Ocean, with descriptions of three new species along the Russian coast. Progress in Oceanography 183, 102263. doi: 10.1016 / j. pocean. 2020.102263", "Hansen HJ (1908) Crustacea Malacostraca. I. In ' The Danish-Ingolf Expedition. Volume III'. (H. Hagerup: Copenhagen, Denmark)", "Wenner EL (1982) Notes on the distribution and biology of Galatheidae and Chirostylidae (Decapoda: Anomura) from the Middle Atlantic Bight. Journal of Crustacean Biology 2, 360 - 377. doi: 10.2307 / 1548053", "Coykendall DK, Nizinski MS, Morrison CL (2017) A phylogenetic perspective on diversity of Galatheoidea (Munida, Munidopsis) from cold-water coral and cold seep communities in the western North Atlantic Ocean. Deep-Sea Research - II. Topical Studies in Oceanography 137, 258 - 272. doi: 10.1016 / j. dsr 2.2016.08.014"]}