Hydroides Gunnerus, 1768

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 : 279-280

Genus Hydroides Gunnerus, 1768

Type-species. Hydroides norvegica Gunnerus, 1768 Diagnosis. (from ten Hove & Kupriyanova 2009). Tube white (sometimes bluish), more or less circular to trapezoidal (with flattened upper surface) in cross-section, peristomes and shallow longitudinal ridges may be present, no distinct keels. A granular overlay may be present. Operculum two-tiered, composed of basal funnel of fused radii and distal verticil (crown) of chitinized spines. Peduncle cylindrical, smooth, without wings, separated or not from opercular funnel by a constriction; formed from second dorsal radiole on one side. Pseudoperculum present. Arrangement of radioles in semi-circles, up to 33 per lobe. Branchial eyes absent. Inter-radiolar membrane generally absent, rarely present. Stylodes absent. Mouth palps absent. Seven thoracic chaetigerous segments, exceptionally more (9 in H. bisecta Imajima & ten Hove, 1989 and Hydroides sp. 2 Bastida-Zavala & ten Hove 2002; 7–9 in H. bannerorum Bailey-Brock, 1991 ). Collar trilobed, tonguelets absent. Thoracic membranes long, forming ventral apron. Collar chaetae bayonet-type and limbate. Apomatus chaetae absent. All uncini saw-shaped with up to 7 teeth; anterior fang simple pointed. Triangular depression present. Abdominal chaetae flat trumpetshaped with denticulate edge. Achaetous anterior abdominal zone absent. Posterior capillary chaetae present. Posterior glandular pad absent.

Remarks. The genus in Australia was recently revised by Sun et al. (2015) to include 26 taxa, 9 of which were found off Lizard Island.