Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Amphinomidae and Euphrosinidae (Annelida, Amphinomida) Author Neal, Lenka Life Sciences Department, Natural History Museum, London SW 7 5 BD, UK Author Wiklund, Helena https://orcid.org/0000-0002-8252-3504 Life Sciences Department, Natural History Museum, London SW 7 5 BD, UK & Department of Marine Sciences, University of Gothenburg, Box 463, 40530 Gothenburg, Sweden & Gothenburg Global Biodiversity Centre, Box 463, 40530 Gothenburg, Sweden Author Gunton, Laetitia M. Australian Museum Research Institute, 1 William Street, Sydney NSW 2010, Australia Author Rabone, Muriel https://orcid.org/0000-0002-8351-2313 Life Sciences Department, Natural History Museum, London SW 7 5 BD, UK Author Bribiesca-Contreras, Guadalupe https://orcid.org/0000-0001-8163-8724 Life Sciences Department, Natural History Museum, London SW 7 5 BD, UK Author Dahlgren, Thomas G. https://orcid.org/0000-0001-6854-2031 Department of Marine Sciences, University of Gothenburg, Box 463, 40530 Gothenburg, Sweden & Gothenburg Global Biodiversity Centre, Box 463, 40530 Gothenburg, Sweden & NORCE Norwegian Research Centre, Bergen, Norway Author Glover, Adrian G. https://orcid.org/0000-0002-9489-074X Life Sciences Department, Natural History Museum, London SW 7 5 BD, UK a.glover@nhm.ac.uk text ZooKeys 2022 2022-12-22 1137 33 74 http://dx.doi.org/10.3897/zookeys.1137.86150 journal article http://dx.doi.org/10.3897/zookeys.1137.86150 1313-2970-1137-33 9407DC6EB6B046AFA9C7F8DDCF542457 038180F7C47A5FCBBD907481025DF21B Bathychloeia Horst, 1910 Type species. Bathychloeia sibogae Horst, 1910. Diagnosis (modified from Boeggemann (2009) ). Body small, fusiform. Prostomium divided into an anterior and posterior lobe, with a median antenna on posterior lobe; paired lateral antennae and palps on anterior lobe. Eyes present or absent. Caruncle with well-developed folds and crenulations. Branchiae bipinnate from chaetiger 5 or 6, where enlarged. Dorsal, lateral and ventral cirri cirriform. Chaetae bifurcate. Pygidial cirri paired, cirriform to digitiform. Remarks. As the name Bathychloeia suggests, this genus was established for deep-water representatives similar to forms in predominantly shallow water genus Chloeia Lamarck, 1818. Chloeia was established by Lamarck (1818) to accommodate Chloeia flava described from the Indian Ocean by Pallas in 1766 and currently contains 20 species occurring in the Indian, Pacific, and Atlantic oceans ( Hartman 1959 ; Barroso and Paiva 2011 ). This genus is morphologically characterised by fusiform body shape and bipinnate branchiae. However, such characteristics are also shared with the rare, uniquely deep-sea genera Bathychloeia Horst, 1910 and Chloenopsis Fauchald, 1977. Bathychloeia has been distinguished from Chloeia by Horst (1910 , 1912 ) mainly due to the presence of enlarged branchiae on chaetiger 5 (the first branchial chaetiger). This genus currently contains two deep-sea species, type species B. sibogae Horst, 1910 described from Malay Archipelago, depth of 1100 m and B. balloniformis Boeggemann , 2009 described from the abyssal Atlantic. Similarly, Chloenopsis Fauchald, 1977 has been established to accommodate species originally described by McIntosh (885) as Chloenea atlantica from the Canary Islands, depth ca. 2800 m. The validity of these genera and their separation from Chloeia has never been phylogenetically tested, but has been previously questioned ( Boeggemann 2009 ).