Omphalopomopsis Saint-Joseph, 1894

Ten Hove, Harry A. & Kupriyanova, Elena K., 2009, Taxonomy of Serpulidae (Annelida, Polychaeta): The state of affairs, Zootaxa 2036, pp. 1-126 : 69

26. Omphalopomopsis Saint-Joseph, 1894

( Fig. 7A, B)

Type-species: Omphalopoma langerhansii Marenzeller, 1885

Number of species: 1

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; without wings; insertion unknown. Pseudoperculum not mentioned in original description, presumably 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 wide till 3 rd segment, further unknown (damaged), apron apparently absent. Tonguelets unknown. Collar chaetae bayonet-like with numerous hair-like processes basally, Spirobranchus - type and limbate. Apomatus chaetae present. Thoracic uncini saw-shaped, with 7–8 teeth above anterior pointed fang. Triangular depression unknown. Abdominal chaetae geniculate, SEM details unknown, probably Vermiliopsis - type (then flat narrow geniculate), apparently with almost smooth edge, very long posteriorly. 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.

Remarks. The taxon is known only from the single holotype deposited in the Natural History Museum of Vienna, NHMW A.N.14552, Inv. no. 2054 ( Fig. 7A, B). The description by Marenzeller (1885) leaves doubt about the shape of the anterior uncinal tooth, it may be either pointed as in Hydroides , or blunt as in Vermiliopsis .

Specimens attributed to Omphalopomopsis by Fauvel (1930, 1953) and Pillai (1960) in reality belong to Pomatostegus actinoceras ( fide Zibrowius (1973b) , as P. stellatus ).

Omphalopomopsis langerhansii ( Marenzeller, 1885) , South Japan, Enoshima, 366 m.