Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS) Author Schejter, L. 0000-0001-5443-4048 Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP). Paseo Victoria Ocampo 1, 7600, Mar del Plata, Argentina. Instituto de Investigaciones Marinas y Costeras (IIMyC), Consejo Nacional de Investigaciones Científicas y Técnicas, Mar del Plata, Argentina. & schejter @ inidep. edu. ar, https: // orcid. org / 0000 - 0001 - 5443 - 4048 Author Genzano, G. 0000-0002-9818-7648 genzano @ mdp. edu. ar; https: // orcid. org / 0000 - 0002 - 9818 - 7648 genzano@mdp.edu.ar Author Pérez, C. D. 0000-0002-0866-1183 Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, Rua Alto do Reservatório s / n, Bela Vista, CEP: 55608 - 680, Vitória de Santo Antão-PE, Brazil. & carlos. perez @ ufpe. br, https: // orcid. org / 0000 - 0002 - 0866 - 1183 Author Acuña, F. Estación Científica Coiba (Coiba-AIP), Clayton, Panamá, República de Panamá. Author Cordeiro, R. T. S. 0000-0002-3164-5333 Departamento de Biologia, Universidade Federal Rural de Pernambuco, Rua Dom Manuel de Medeiros, s / n, Dois Irmãos, CEP: 52171 - 900, Recife / PE, Brazil. & Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA ralfts @ gmail. com; https: // orcid. org / 0000 - 0002 - 3164 - 5333 ralfts@gmail.com Author Silva, R. A. Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, Rua Alto do Reservatório s / n, Bela Vista, CEP: 55608 - 680, Vitória de Santo Antão-PE, Brazil. Author Garese, A. Author Bremec, C. S. text Zootaxa 2020 2020-11-13 4878 2 201 239 journal article 7936 10.11646/zootaxa.4878.2.1 b10a81a2-3936-425a-92b6-9e52fd7be1e7 1175-5326 4424884 F930E674-DDA9-4EC9-B0E9-3891B239C6CF Bayergorgia vermidoma Williams & Lopez-Gonzalez, 2005 Material examined: BBB 2016: St. 12; St. 13; St. 18; St. 21; St. 23; St. 26; St. 36; St. 38; St. 40. PD BB 2017: St. 14; St. 21; St. 43 (MACN-In: 43486, 43487). Distribution: Drake Passage ( 61°26.08’S , 58°06.2’W , 1047–1227 m ); Elephant Island, ( 61°18.14’S , 56°8.27’W , 281.1–288.6 m ); Shag Rocks ( 53°23.59’S , 42°41.78’W , 223.6–307 m ) Antarctic Peninsula, South Shetland Is.; South Georgia Is. ( 54°29’S , 39°22’W , 659–686 m ); South Orkney Is. ( 60°22’S , 46°50’W , 298–403 m ) ( Williams & López-González 2005 ); off Cape Horn ( 57°00.33’S , 67°35.1’W , 450 m ; 57°13.81’S , 67°02.32’W 1100 m ); Burdwood bank 54°31´S , 62°11´W 330 m as Clavularia sp. ( Schejter et al . 2016a ).); Elephant Island ( 61°15´S , 56°24´W , 450 m ) ( Auscavitch & Waller 2017 ); Drake Passage, 57°04´S , 67°30´W , 850 m (Waller & Robinson 2011 as Bayergorgia sp.); off Tierra del Fuego, Burdwood bank ( 130–785 m ) (present study). Remarks: The original diagnosis of the species does not include branched specimens ( Williams & López-González 2005 ). Although the authors discuss some branched forms, it is unlikely these specimens correspond to a different new species. Besides the presence of branching, we could not find clear boundaries between those two morphotypes either in the specimens examined herein or in specimens from other areas (unpublished data). Thus, we suggest the emendation of the diagnosis of B. vermidoma to include both branched and unbranched forms. Some of the studied specimens presented epibionts, mainly other cnidarians (see Schejter et al. 2020 ).