Omphalopomopsis Saint-Joseph, 1894

Bailey-Brock, Julie H. & Magalhães, Wagner F., 2012, A new species and record of Serpulidae (Annelida: Polychaeta) from Cross Seamount in the Hawaiian Chain, Zootaxa 3192, pp. 49-58 : 53

Genus Omphalopomopsis Saint-Joseph, 1894

Type-species: Omphalopoma langerhansii Marenzeller, 1885

Generic diagnosis (modified from ten Hove & Kupriyanova, 2009: 69). Tube subcylindrical, white, opaque, with 3 denticulate keels and an occasional low collar-like ring. Granular overlay not observed. Operculum bulbous with slightly convex brilliantly white calcareous endplate. Peduncle cylindrical, broadening and wrinkled towards opercular ampulla, constriction present; two small swellings (not wings) present where ampulla joins the opercular stalk. Pseudoperculum absent. Up to 25 pairs of radioles, arranged in two circles/short spires. Inter-radiolar membrane absent. Branchial eyes, stylodes, and mouth palps not observed. 7 thoracic chaetigerous segments. Collar trilobed, well developed, especially medio-ventrally; thoracic membranes well developed anteriorly extending beyond the last thoracic chaetiger, apron absent. Tonguelets unknown. Collar chaetae bayonet-like with numerous hair-like processes basally, Spirobranchus - type and limbate. Apomatus chaetae present from chaetiger 3. Thoracic uncini saw-shaped, with 7–8 teeth above anterior pointed fang. Triangular depression unknown. Abdominal chaetae flat narrow geniculate, longer on posterior chaetigers. Uncini saw-shaped anteriorly with 7 teeth and fang, rasp-shaped posteriorly. Achaetous zone not known. Long posterior capillary chaetae present. Posterior glandular pad not observed.