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 Nidalia sp. Material examined: BBB 2016: St. 16. Remarks: The genus has been reported in the Indian Ocean, Western Atlantic, and Western Pacific ( Pérez et al. 2011 ), but there were no records until present in subantarctic waters. The previous bathymetric records of the genus reached 549 m depths ( N. dissidens in Strait of Florida). Herein, 1000 m represents the new lower depth for the genus. Pérez et al . (2011) cited N. occidentalis (mushroom-shaped polyparium and without sclerites in the introvert) and Nidalia sp. for Brazilian coast. Using the key to the genus of Verseveldt & Bayer (1988) , our specimen would fit N. simpsoni , but our morphotype has fewer rows of crown spindles (10–14 to 15–20 in N. simpsoni ), more spindles at the points (10–19 to 6–10) and points not in chevron. In addition, N. simpsoni was described from Indonesian Archipelago and Palau Islands. Our specimen has a torch-like capitulum and introvert with numerous small dumbbells as Nidalia sp. sensu Pérez et al . (2011) , but differs in having fewer rows of crown spindles (10–14 to 18), more spindles per point (10–19 to 6–8) and smaller spindles from crown and stalk. Herein, we consider it a possible new species.