Four new species and further records of Dorvilleidae (Annelida, Polychaeta) from deep-sea organic substrata, NE Atlantic Author Ravara, Ascensão 677F8AB4-7FD3-483A-A047-C4BD5A6A449D Centro de Estudos do Ambiente e do Mar, Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810 - 193 Aveiro, Portugal. Department of Marine Sciences, University of Gothenburg, Carl Skottbergsgata 22 B, 413 19 Gothenburg, Sweden. Life Sciences Department, Natural History Museum, Cromwell Rd, London SW 7 5 BD, UK. aravara@ua.pt Author Wiklund, Helena 114C3853-7E48-42AC-88F3-F7AC327B24F3 Department of Marine Sciences, University of Gothenburg, Carl Skottbergsgata 22 B, 413 19 Gothenburg, Sweden. & Life Sciences Department, Natural History Museum, Cromwell Rd, London SW 7 5 BD, UK. helena.wiklund@marine.gu.se Author Cunha, Marina R. 553A98B5-0AE0-424F-9ED5-EC50F129519C Centro de Estudos do Ambiente e do Mar, Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810 - 193 Aveiro, Portugal. Department of Marine Sciences, University of Gothenburg, Carl Skottbergsgata 22 B, 413 19 Gothenburg, Sweden. Life Sciences Department, Natural History Museum, Cromwell Rd, London SW 7 5 BD, UK. marina.cunha@ua.pt text European Journal of Taxonomy 2021 2021-02-26 736 44 81 journal article 7960 10.5852/ejt.2021.736.1251 96544bf9-acb7-48fc-ae04-60da8dc5561a 2118-9773 4570204 68249639-5FAD-4860-A2EA-0D34690C10FC Ophryotrocha mammillata Ravara, Marçal, Wiklund & Hilário, 2015 Ophryotrocha mammillata Ravara et al. , 2015: 5 , figs 4–12 ( type locality: Setúbal Canyon, W Portugal , NE Atlantic). Material examined MOROCCO • 2 specs (ethanol), 1 spec. (slide preparation); GoC, Mercator MV, 35°17.916′ N , 06°38.709′ W ; 354 m depth ; 2 Mar. 2008 ; Stn 64PE284_12750W; wood substrata ; DBUA0002279.01 • 1 spec. (ethanol); GoC, Meknès MV; 34°59.091′ N , 07°04.424′ W ; 698 m depth ; 20 May 2009 ; Stn B09- 14b_03A; alfalfa substratum ; DBUA0002280.01 • 1 spec. (ethanol); GoC, Darwin MV; 35°23.523′ N , 07°11.513′ W ; 1100 m depth ; 19 May 2009 ; Stn B09-14b_02W; wood substratum ; DBUA0002280.02 • 2 specs (formalin), 3 specs (paragenophores, in ethanol); same collection data as for preceding; 19 May 2009 ; Stn B09-14b_02A; alfalfa substrata; DBUA 0002280.03. Additional material PORTUGAL • 2 specs (ethanol); WIM, Setúbal Canyon ; 38°16.856′ N , 09°06.734′ W ; 1000 m depth ; 22 Aug. 2012 ; on bone material from an experimentally deployed cow carcass; DBUA0001555.04 . Remarks This species was recently described from an experimentally deployed mammal carcass for a similar amount of time (approximately 18 months) at the Setúbal Canyon (WIM) ( Ravara et al. 2015 ). The morphological identification was confirmed with molecular analyses ( Fig. 2 ). This study extends its distribution to the Gulf of Cadiz where it occurred associated with experimentally deployed wood and alfalfa substrata. Curiously, O. mammillata was not found in the wood-fall collected at Estremadura Spur (WIM), a site very close to its type locality. It is worth mentioning here that in the GoC only five specimens of O. mammillata were retrieved, compared to 198 specimens previously reported from the Setúbal Canyon ( Ravara et al . 2015 ). Ecology and distribution NE Atlantic: from Setúbal Canyon (West Iberian Margin) to the Gulf of Cadiz. Found in experimentally deployed organic falls (mammal carcasses, wood and alfalfa substrata), at a depth of 354–1100 m ( Ravara et al. 2015 ; present study).