Hydroids (Cnidaria, Hydrozoa) from Mauritanian Coral Mounds Author Gil, Marta Departamento de Ecoloxía e Bioloxía Animal, Facultade de Ciencias do Mar e Centro de Investigación Mariña (CIM-UVigo), Universidade de Vigo. Campus Lagoas-Marcosende. 36310 Vigo. Spain. & Instituto Español de Oceanografía, Centro Oceanográfico de Vigo. Subida Radio Faro 50. 36390 Vigo. Spain. Author Ramil, Fran Departamento de Ecoloxía e Bioloxía Animal, Facultade de Ciencias do Mar e Centro de Investigación Mariña (CIM-UVigo), Universidade de Vigo. Campus Lagoas-Marcosende. 36310 Vigo. Spain. & framil @ uvigo. es Author Agís, José Ansín Departamento de Ecoloxía e Bioloxía Animal, Facultade de Ciencias do Mar e Centro de Investigación Mariña (CIM-UVigo), Universidade de Vigo. Campus Lagoas-Marcosende. 36310 Vigo. Spain. & ansinjose @ gmail. com text Zootaxa 2020 2020-11-16 4878 3 412 466 journal article 7931 10.11646/zootaxa.4878.3.2 288c6fc9-269b-468f-8811-d79d4350f6e4 1175-5326 4425132 4F59F5B2-CFDB-4819-AF83-0EF232328F8D Diphasia margareta ( Hassall, 1841 ) Sertularia margareta Hassall, 1841: 284 , pl. VI, figs. 3 – 4. Diphasia pinaster : Hincks, 1868: 252–253 , pl. L, fig. 1; Cornelius, 1995b: 50–53 , fig. 10. Diphasia elegans G.O. Sars, 1873: 107–108 , tab.III, figs. 23–26. Diphasia margareta: Cornelius, 1979: 263–265 , fig. 11; Ramil & Vervoort, 1992: 201–210 , figs.52, 53, 54, 55, 56C–E, 57A, 58; Gil & Ramil, 2017b: 309–318 , figs 4–7. Diphasia pectinata : Vervoort, 1959: 255–256 , figs. 23–24 [Not Diphasia pectinata : Lamarck, 1816 = Diphasia nigra (Pallas, 1766) ]. Material examined. MSM 16 /3, stn GeoB 14871–2, ROV, 19°08.344’– 19°08.235’N , 16°45.849’– 16°45.664’W , 427–566 m , 9-XI-2010 : three colonies 22–46 mm high, two of them growing on Sertularella gayi ; one colony with female gonothecae . MSM 16 /3, stn GeoB 14886–1, ROV, 18°39.013’– 18°38.476’N , 16°43.580’– 16°43.757’W , 484–640 m , 12-XI- 2010 : one colony 60 mm high, growing on Madrepora oculata , no gonothecae . MSM 16 /3, stn GeoB 14914–1, ROV, 17°08.203’– 17°07.898’N , 16°49.478’– 16°48.878’W , 417–514 m , 17-XI- 2010 : one colony on Sertularella gayi , without gonothecae . Remarks. This species was re-described in detail by Gil & Ramil (2017b) , including a discussion of its taxonomical status and a review of types of substrates, reproductive periods and its geographical distribution. Diphasia margareta is a Northeastern Atlantic species widely distributed in Northwest Africa, from Northern Morocco to Guinea Bissau , Canary and Cape Verde Islands.