FB-69377 http://www.fishbase.org/summary/SpeciesSummary.php?id=69377 Animalia Chordata Teleostei Cichliformes Cichlidae Gymnogeophagus Gymnogeophagus peliochelynion Turcati, Serra-Alanis & Malabarba, 2018 Antarctic dark-mouth skate Bathyraja griseocauda (non Norman, 1937) Bathyraja n. sp. (dwarf) Not applicable Bathyraja sp. Not applicable Bathyraja sp. (dwarf) Not applicable Raja arctowskii Dollo, 1904 2021-02-10 2021-02-18 Springer, S.0 Three species of skate (Rajidae) from the continental waters of Antarctica. Antarct. Res. Ser. 17:1-10. (Ref. 5145) Stehmann, M. and D.L. Bürkel0 Rajidae. p. 86-97. In O. Gon and P.C. Heemstra (eds.) Fishes of the Southern Ocean. J.L.B. Smith Institute of Ichthyology, Grahamstown, South Africa. 462 p. (Ref. 5159) Smith, P.J., D. Steinke, S.M. Mcveagh, A.L. Stewart, C.D. Struthers and C.D. Roberts0 Molecular analysis of Southern Ocean skates (<i>Bathyraja</i>) reveals a new species of Antarctic skate. J. Fish Biol. 73(5):1170-1182. (Ref. 93260) Weigmann, S.0 Annotated checklist of the living sharks, batoids and chimaeras (Chondrichthyes) of the world, with a focus on biogeographical diversity. J. Fish Biol. 88(1):1-201. (Ref. 106604) Hanchet, S.M., A.L. Stewart, P.J. McMillan, M.R. Clark, R.L. O'Driscoll and M.L. Stevenson0 Diversity, relative abundance, new locality records, and updated fish fauna of the Ross sea region. Antarctic Science 2013:1-18. (Ref. 114662) Stehmann, M.F., S. Weigmann and G.J. Naylor0 First complete description of the dark-mouth skate <i>Raja arctowskii</i> Dollo, 1904 from Antarctic waters, assigned to the genus <i>Bathyraja</i> (Elasmobranchii, Rajiformes, Arhynchobatidae). Mar. Biodiv. 51(1):1-27. (Ref. 123566) IUCN0 The IUCN Red List of Threatened Species. Version 2022-2. <https://www.iucnredlist.org/>. Downloaded 10 Jan 2023. (Ref. 126983) Beolens, B., M. Grayson and M. Watkins0 Eponym dictionary of Fishes. Dunbeath, Caithness (Scotland, UK): Whittles Publishing Limited, 1300 p. (Ref. 128868) FB-GeneralDescr-69387 http://purl.org/dc/dcmitype/Text text/html Estelita Emily Capuli 2021-02-24 00:00:00 2021-02-24 00:00:00 Biology http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=69387 Individuals collected deeper than 810 m indicate that the species possibly occurs in greater depths in the Pacific sector, but may also be the result of differing fishery efforts in the respective depths. Most specimens caught deeper than 810 m were adults but were also recorded from shallower depths elsewhere and juveniles in turn were also recorded deeper than 810 m and even below 1000 m (Ref. 123566). Stehmann, M.F., S. Weigmann and G.J. Naylor 2021 First complete description of the dark-mouth skate <i>Raja arctowskii</i> Dollo, 1904 from Antarctic waters, assigned to the genus <i>Bathyraja</i> (Elasmobranchii, Rajiformes, Arhynchobatidae). Mar. Biodiv. 51(1):1-27. (Ref. 123566) FB-DiagnosticDescr-69387 http://purl.org/dc/dcmitype/Text text/html Estelita Emily Capuli 2021-02-24 00:00:00 2021-02-24 00:00:00 http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=69387 This species is characterized by the following: usually completely medium to dark grayish pigmented mouth cavity, often dark underside of the nasal curtain from very small juvenile stages onwards; differs from most congeners in Antarctic and Subantarctic waters in the absence of thorns on the dorsal disc. It is further distinguished by the following characters: discevenly inverse heart-shaped (the disc margins distinctly undulated in adult males, but not or slightly undulated in others), with broadly rounded outer corners and with body length to mid-cloaca shorter than or equal to tail length from mid-cloaca; preorbital snout length 8.1-16.2% TL (depending on ontogenetic stage) and distance between first gill slits 14.2-15.9% TL; orbits are moderately large, horizontal diameter 1.3-1.8 times interorbital width; upper side of the disc and tail entirely rough, prickly with dermal denticles while the underside is smooth; except for alar thorns of mature males, no thorns on disc but only a median row of 19-30 small thorns along tail to first dorsal fin, the thorns become smaller and more widely spaced posteriorly in subadults and adults and are generally wider spaced in large juveniles to adults as compared with small juveniles; bases of low, more or less equal-sized dorsal fins confluent or with short interspace; postdorsal tail section very short, 1.7-5.2% TL, with low epichordal caudal lobe which is confluent with second dorsal fin; opened clasper tip shows all components typical for Bathyraja species, of which most apparent a long and deep pseudosiphon (ps) along outer edge of dorsal lobe, as well as a massive projection (pj) over entire length of the inner ventral lobe; clasper terminal skeleton with distal processes of dorsal marginal cartilage (forming external pseudorhipidion) and ventral marginal cartilage (forming external projection), 3 dorsal terminal cartilages (with dt1 very large and encapsulating terminal skeleton), ventral terminal, and one accessory terminal cartilage; apparent sexual dimorphism in scapulocoracoid, with post-mesocondyle length longer in females than in males. Colouration: dorsal ground color plain dark to medium grayish-brown, often with mostly indistinct scattered pale and dusky spots on disc, the posterior pelvic lobes and on sides of tail, occasionally with transverse white pseudoocellus stripe on inner posterior pectorals; ventral or underside mostly plain white or pale, often with gray marked cloaca and gray spots on belly to gill region, occasionally gray spotted posterior pectoral margins, origin and sides of tail, or tail partly dark; mouth cavity and underside of nasal curtain at least partly, usually completely pigmented medium to dark grayish from very small juvenile stages onwards (Ref. 123566). Stehmann, M.F., S. Weigmann and G.J. Naylor 2021 First complete description of the dark-mouth skate <i>Raja arctowskii</i> Dollo, 1904 from Antarctic waters, assigned to the genus <i>Bathyraja</i> (Elasmobranchii, Rajiformes, Arhynchobatidae). Mar. Biodiv. 51(1):1-27. (Ref. 123566) FB-Distribution-69387 http://purl.org/dc/dcmitype/Text text/html Estelita Emily Capuli 2021-02-24 00:00:00 2023-01-10 00:00:00 http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=69387 Southern Ocean: widespread, circumantarctic: Atlantic sector (off the South Shetland, Brabant, and Biscoe Islands to the South-East Weddell Sea); Pacific (Ross Sea); Indian (from Prydz Bay). Stehmann, M.F., S. Weigmann and G.J. Naylor 2021 First complete description of the dark-mouth skate <i>Raja arctowskii</i> Dollo, 1904 from Antarctic waters, assigned to the genus <i>Bathyraja</i> (Elasmobranchii, Rajiformes, Arhynchobatidae). Mar. Biodiv. 51(1):1-27. (Ref. 123566) FB-Size-69387 http://purl.org/dc/dcmitype/Text text/html Estelita Emily Capuli 2021-02-24 00:00:00 2021-02-24 00:00:00 Max. size http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=69387 61.0 cm TL (male/unsexed; (Ref. 123566)); 53.5 cm TL (female) Stehmann, M.F., S. Weigmann and G.J. Naylor 2021 First complete description of the dark-mouth skate <i>Raja arctowskii</i> Dollo, 1904 from Antarctic waters, assigned to the genus <i>Bathyraja</i> (Elasmobranchii, Rajiformes, Arhynchobatidae). Mar. Biodiv. 51(1):1-27. (Ref. 123566) FB-Threats-2 http://purl.org/dc/dcmitype/Text text/html Belen Acosta 1990-10-18 00:00:00 2024-03-07 00:00:00 http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=2 Least Concern (LC) , IUCN Grouper and Wrasse Specialist Group IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006. FB-Habitat-69387 http://purl.org/dc/dcmitype/Text text/html Estelita Emily Capuli 2021-02-24 00:00:00 2021-02-24 00:00:00 Environment http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=69387 demersal; marine; depth range 0 - 1685 m (Ref. 123566), usually 126 - 810 m (Ref. 123566) Stehmann, M.F., S. Weigmann and G.J. Naylor 2021 First complete description of the dark-mouth skate <i>Raja arctowskii</i> Dollo, 1904 from Antarctic waters, assigned to the genus <i>Bathyraja</i> (Elasmobranchii, Rajiformes, Arhynchobatidae). Mar. Biodiv. 51(1):1-27. (Ref. 123566) Stehmann, M.F., S. Weigmann and G.J. Naylor 2021 First complete description of the dark-mouth skate <i>Raja arctowskii</i> Dollo, 1904 from Antarctic waters, assigned to the genus <i>Bathyraja</i> (Elasmobranchii, Rajiformes, Arhynchobatidae). Mar. Biodiv. 51(1):1-27. (Ref. 123566)