Streblosoma Sars, 1872

Hutchings, Pat, Nogueira, João Miguel Matos & Carrerette, Orlemir, 2015, Telothelepodidae, Thelepodidae and Trichobranchidae (Annelida, Terebelliformia) from Lizard Island, Great Barrier Reef, Australia, Zootaxa 4019 (1), pp. 240-274 : 247

Genus Streblosoma Sars, 1872

Streblosoma . – Hutchings & Glasby 1987: 222.

Type-species. Grymaea bairdi Malmgren, 1866 , by original designation.

Diagnosis. Transverse prostomium attached to dorsal surface of upper lip; basal part usually with eyespots; distal part low, restricted to base of upper lip. Buccal tentacles all uniformly cylindrical. Peristomium forming lips, sometimes continuing dorsally as narrow annulation, with nuchal organs as thin ciliated row on anterior margin; short, hood-like upper lip, about as long as wide; lower lip also short, button-like, restricted to oral area. Short anterior segments, usually visible all around body, segment 1 frequently with ventral lobe posterior to lower lip, lobes on following anterior segments absent. Branchiae usually present, 2–3 pairs beginning from segment 2, each pair with numerous independent curled filaments, progressively tapering to tips, mid-dorsal gap between filaments of each side within pairs either present or absent. Anterior body highly glandular ventrally, swollen, smooth to strongly tessellated. Notopodia beginning from segment 2, extending for variable number of segments; conical and relatively short notopodia, distally bilobed, chaetae emerging between lobes. Winged notochaetae in both rows, those from anterior row broadly-winged in several species, with wings somewhat twisted. Neuropodia beginning from segment 5 as fleshy ridges anteriorly and as raised pinnules after termination of notopodia. Neurochaetae throughout as short-handled avicular uncini, with dorsal button at anterior third of base or terminal, prow, if conspicuous, usually distinctly short, and strongly curved, convex base in most taxa; uncini usually in single, straight rows, a few species with uncini arranged in curved, C-shaped to looped rows. Nephridial and genital papillae usually present, posterior to bases of notopodia of segments 4–7. Pygidium smooth to slightly crenulate.

Remarks. This is a large genus distributed worldwide, currently there are over 40 known species, of which eight occur in Australia. Prior to this study none was known from the Great Barrier Reef.