Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Annelida: Capitellidae, Opheliidae, Scalibregmatidae, and Travisiidae Author Wiklund, Helena Author Neal, Lenka Author Glover, Adrian G. Author Drennan, Regan Author Muriel Rabone, Author Dahlgren, Thomas G. text ZooKeys 2019 883 1 82 http://dx.doi.org/10.3897/zookeys.883.36193 journal article http://dx.doi.org/10.3897/zookeys.883.36193 1313-2970-883-1 7ABDE7F0DD424B968A1380E1E59B1515 EAC9B5058CE55C5AA9A344F6FEFA25D5 Ophelina Orsted , 1843 Notes. Orsted (1843) erected Ophelina for O. acuminata from Danish coasts. It is now represented by around 60 species ( Read and Fauchald 2019 ), although the numbers vary according to different workers due to its confused taxonomic history ( Maciolek and Blake 2006 ; Parapar et al. 2011 ). Ophelina is the most diverse genus of the family Opheliidae , although it likely represents a paraphyletic grouping ( Law et al. 2014 ). This genus is represented in UKSR-collected material by 11 species as revealed by molecular analysis. The diagnosis of Ophelina presented here follows that given by Maciolek and Blake (2006) . Diagnosis. Body elongate, with deep ventral groove and two lateral grooves along entire length of body. Prostomium conical, sometimes with terminal palpode; eyes present or absent. Branchiae present or absent; if present, beginning on chaetiger 2, continuing to posterior end, sometimes absent from middle or far posterior chaetigers; branchiae single, cirriform. Segmental lateral eyes absent. Noto- and neuropodia with small fascicles of capillary chaetae; small ventral cirrus present. Pygidium with anal funnel sometimes bearing long unpaired cirrus and additional lateral cirri.