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 Streptocaulus multiseptatus ( Bale, 1915 ) Cladocarpia multisepatus Bale, 1915: 304–306 , pl. 47 figs. 1–5. Cladocarpus multiseptatus : Alvarez Claudio, 1993: 221–224 , fig. 38, Lam. XX; Álvarez Claudio, 1995: 13–14 , fig. 2.1; Bouillon et al ., 2004: 124 , fig. 65K. Cladocarpus cf. multiseptatus: Ramil & Vervoort, 1992: 109–111 , fig. 27a. Streptocaulus multiseptatus : Ramil & Vervoort, 2008: 417–421 , figs. 1–2. Material examined. MAURIT-0911, stn MUDR06 , 17º40´22”N , 16º40´11”W , 435 m , 10-XII-2009 : four colonies, without phylactocarps . Biology. Colonies of S. multiseptatus with phylactocarps and gonothecae have been found only in November ( Ramil & Vervoort 2008 ). Our material was found on the cold-water coral mound barrier. Distribution. This species is known from Australia , Bay of Biscay, Alboran Sea and the Sahara coast; its bathymetric distribution ranges from 135 to 576 m ( Ramil & Vervoort 2008 ). In West Africa, S. multiseptatus was reported in Western Sahara ( Ramil & Vervoort 2008 ) and also in Mauritania ( Gil & Ramil 2017a ). Our material was collected from a depth of 435 m off Nouakchott , representing the southernmost record of the species in the Atlantic Ocean . Remarks. The material examined by us is consistent with the description of S. multiseptatus given by Ramil & Vervoort (2008) on the basis of material collected off the Sahara coast.