Chitinopoma Levinsen, 1884

Ten Hove, Harry A. & Kupriyanova, Elena K., 2009, Taxonomy of Serpulidae (Annelida, Polychaeta): The state of affairs, Zootaxa 2036, pp. 1-126 : 32

4. Chitinopoma Levinsen, 1884

( Fig. 11)

Type-species: Chitinopoma fabricii Levinsen, 1884 = junior synonym of Vermilia serrula Stimpson, 1854 .

Number of species: 3 (possibly 4)

Tube white, opaque, with single longitudinal keel, triangular or sub-triangular in cross-section, with brood chambers. Hyaline granular overlay absent. Operculum inverse conical, with chitinous endplate. Peduncle cylindrical, smooth, without distal wings, constriction present; inserted as second dorsal radiole on one side. Pseudoperculum absent. Radioles arranged in semi-circles, up to 7 radioles per lobe, inter-radiolar membrane absent. Branchial eyes and stylodes absent. Mouth palps not observed. 7 thoracic chaetigerous segments. Collar trilobed with entire edge, tonguelets between ventral and lateral collar lobes absent. Thoracic membranes short, ending at second thoracic chaetiger. Collar chaetae fin-and-blade, fin well separated from blade, and limbate ( Fig. 11A). Apomatus chaetae present ( Fig. 11B). Thoracic uncini saw-shaped, with about 12 teeth ( Fig. 11C); anterior peg simple, rounded. Thoracic triangular depression absent. Abdominal chaetae with large flat triangular denticulate blade ( Fig. 11E); uncini rasp-shaped ( Fig. 11D). Achaetous anterior abdominal zone absent. Posterior capillary chaetae absent. Posterior glandular pad absent.

Remarks. The partial revision of the genus by Zibrowius (1969a) showed that the brooding Chitinopoma serrula is a species widely distributed in the Arctic and boreal North Atlantic. Later, brooding C. arndti Zibrowius, 1983 was added and C. rzhavskii ( Kupriyanova, 1993a) was transferred from Filogranula ( Kupriyanova et al. 2001) . However, various forms of brooding of embryos, the main character distinguishing Chitinopoma from Filogranula , are very common for small serpulid species ( Kupriyanova et al. 2001). Additional studies are needed to determine whether these two genera should be synonymized. Probably the nominal taxon Ficopomatus capensis Day, 1961 belongs here as well ( fide ten Hove & Weerdenburg 1978: 101 ).

1. Chitinopoma arndti Zibrowius, 1983 , St. Paul, Amsterdam Island, southern Atlantic

2.? Chitinopoma capensis ( Day, 1961) , South Africa

3. Chitinopoma rzhavskii ( Kupriyanova, 1993a) , Kamchatka

4. Chitinopoma serrula ( Stimpson, 1854) , Arctic, North Atlantic.