Eusyllinae (Polychaeta: Syllidae) from Australia with the Description of a New Genus and Fifteen New Species Author San Martin, G Author Hutchings, PA text Records of the Australian Museum 2006 58 257 370 journal article 2201-4349 Streptosyllis biarticulata Hartmann-Schröder, 1991 Fig. 84A–F Streptosyllis biarticulata Hartmann-Schröder, 1991: 36 , figs 57–61. Material examined . AUSTRALIA : QUEENSLAND : Heron Is. , Great BarrierReef , 23°27'S 151°55'E , coarsesand,intertidal, 4 Feb1976 , coll. G. Hartmann-Schröder , holotype ( HZM P-20545) . Description . Body 2.5 mm long, 0.2 mm wide, with 35 chaetigers, incomplete specimen. Prostomium oval, with 4 large eyes in trapezoidal arrangement. Antennae broken (and not in vial); point of insertion not visible. Palps shorter than prostomium, fused basally. Peristomium well defined, shorter than following segments; dorsal tentacular cirri with about 6 articles, ventral tentacular cirri smooth, shorter than dorsal ones. Most dorsal cirri detached; dorsal cirri with 4– 7 articles. Enlarged aciculae ( Fig. 84C ) from chaetigers 2– 4, large basally, distally blunt. Subsequent aciculae and aciculae of chaetiger 1, similar but much thinner ( Fig. 84F ). Compound chaetae with thick shafts, some of them provided with thin hood distally, and blades distally blunt, unidentate, with short spines on margin, and slight dorsoventral gradation in length of blades within fascicle ( Fig. 84E ), 13 µm in length dorsally, 7 µm in length ventrally. Compound chaetae of chaetigers 3–4 with distinctly shorter blades, blunt, short, with thick shafts, some covered by translucent hood ( Fig. 84B ). Dorsal simple chaetae from chaetiger 1, thick, distally blunt, with hood, longitudinally striated ( Fig. 84A ), becoming thicker posteriorly ( Fig. 84D ). Ventral simple chaetae absent. Pharynx extends for about 4 segments. Proventricle extending for 3.5 segments, with about 35 muscle cell rows. Fig. 83. SEM of Streptosyllis aequiseta Hartmann-Schröder, 1981 . ( A ) anterior end, ventral view; ( B ) detail of prostomium, showing the papillae of palps; ( C ) dorsal compound chaeta, posterior parapodium; ( D ) same, anterior parapodium; ( E ) dorsal simple chaeta, anterior parapodium, lateral view; ( F ) dorsal simple chaeta, inferior view, posterior parapodium. AM W28370. Habitat . Occurring in coral sand, intertidally. Distribution . Australia ( Queensland ).