Streptosyllis biarticulata Hartmann-Schröder, 1991

San Martin, G & Hutchings, PA, 2006, Eusyllinae (Polychaeta: Syllidae) from Australia with the Description of a New Genus and Fifteen New Species, Records of the Australian Museum 58, pp. 257-370 : 356-357

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.

Habitat. Occurring in coral sand, intertidally.

Distribution. Australia (Queensland).