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 Convexella magelhaenica ( Studer, 1879 ) Material examined: BBB 2016: St. 12; St. 13; St. 16; St. 21; St. 23; St. 25; St. 26; St. 28; St. 31; St. 32; St. 33; St. 34; St. 35; St. 36; St. 38; St. 39. PD BB 2017: St. 9; St. 11; St. 14; St. 16; St. 21; St. 23; St. 26; St. 27; St. 28; St. 34; St. 35; St. 36; St. 43. GARCÍA 2015: St. 17bis ( Fig. 2C ) (MACN-In: 43490, 43491, 43492, 43493, 43494, 43495, 43496, 43497, 43498, 43499, 43500, 43501, 43502, 43503). Distribution: Canal Pasaje, Chile , 12 m ( Häussermann et al. 2016 ); Patagonian Shelf ( 38°20.31′S , 55°40.35′W , 93 m ) ( Rojo de Almeida et al. 2010 ); Straits of Magellan and Le Maire, Drake Passage, Tierra del Fuego, Malvinas and South Orkney Islands (52°52’– 59°49’S , 55°30’– 75°41’W ), 73–1647 m ( Bayer 1996b ); Burdwood bank, 111 m ( Broch 1965 ); off Staten Is., Burdwood bank ( 128–1000 m ) (present study). Remarks : Synonyms: Primnoella magelhaenica : Broch, 1965 . This species has been widely reported and figured in Antarctic and sub-Antarctic waters ( Bayer 1996b ; Häussermann et al. 2016 ). It was frequent in several stations of the current study, and is reported as one of the most common species in the Southern Ocean ( Auscavitch & Waller 2017 ). Convexella magelhaenica is a prolific source of natural products, like the dolabellane diterpenoids, new marine product isolated from this octocoral by Rojo de Almeida et al . (2010) with cytotoxic activity against human pancreatic adenocarcinoma cell. Specimens were mostly salmon to red in color, but some also white. Some specimens also showed sparsely branching pattern, not often reported for this species.