Dasynema Saint-Joseph, 1894

Kupriyanova, Elena K., Sun, Yanan, Ten Hove, Harry A., Wong, Eunice & Rouse, Greg W., 2015, Serpulidae (Annelida) of Lizard Island, Great Barrier Reef, Australia, Zootaxa 4019 (1), pp. 275-353 : 279

Genus Dasynema Saint-Joseph, 1894

Type-species. Serpula chrysogyrus Grube, 1876

Diagnosis. (from ten Hove & Kupriyanova 2009). Tube white, opaque, with some orange, semi-circular in crosssection, with peristomes and (5) irregular longitudinal keels. Hyaline granular overlay of the tube absent. Operculum with fleshy globular ampulla proximally, calcium carbonate infiltrated chitinous cone distally. Peduncle smooth, without pinnules, broadly flattened, with unpaired basal wing for 2/3rd of its length and paired small distal wings, separated from ampulla by constriction; inserted at the base of radiolar crown below and between 1st and 2nd radioles. Pseudoperculum absent. Radioles arranged in two semi-circles and connected by short inter-radiolar membrane. Radioles with ocellar clusters and unpaired outwardly directed stylodes, up to 15 radioles per lobe. Mouth palps not observed. Seven thoracic chaetigerous segments. Collar trilobed, tonguelets absent. Thoracic membranes ending at 5th chaetiger, no apron. Collar chaetae limbate. Apomatus chaetae present. Thoracic uncini saw-shaped, with numerous (approximately 17) teeth, anterior peg blunt (not gouged or pointed). Triangular depression present. Abdominal chaetae flat narrow geniculate with blunt teeth along blade ( Vermiliopsis type). Abdominal uncini saw-shaped anteriorly, with 11–12 teeth, posteriorly rasp-shaped with 2–4 rows of teeth, 14–15 teeth in profile. Achaetous anterior abdominal zone absent. Posterior capillary chaetae present, very long. Posterior glandular pad present.

Remarks. This poorly known monotypic genus is easily recognizable because of its characteristic feature, outwardly directed stylodes on the radioles, which is unique for serpulids. For a detailed differential diagnosis see Imajima & ten Hove (1984: 55).