Streptosyllis magnapalpa Hartmann-Schröder, 1981

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 : 358

Streptosyllis magnapalpa Hartmann-Schröder, 1981

Fig. 85A–H

Streptosyllis magnapalpa Hartmann-Schröder, 1981: 33 , figs 59– 67; 1982: 65, fig. 47; 1983: 13; 1987: 38.

Material examined. AUSTRALIA: WESTERN AUSTRALIA: Horrocks , algae, seagrass and sand, 28°23'S 114°26'E, intertidal, 17 Oct 1975, coll. G. Hartmann-Schröder, paratype ( HZM P-16488); Cervantes, 30°30'S 115°03'E, fine sand and Posidonia , intertidal, coll. G. Hartmann- Schröder, 24 Oct 1975, 1 ( HZM P-17019) .

Description. Body fragile, without colour markings; largest complete specimen 2.8 mm long, 0.2 mm wide, with 37 chaetigers. Prostomium oval, with 4 eyes in open trapezoidal arrangement; tuft of cilia present in front of anterior eyes. Antennae short, smooth, slightly club-shaped; median antenna missing (broken and lost), arising on middle of prostomium; lateral antennae inserted near anterior margin of prostomium ( Fig. 85A). Palps shorter than prostomium, fused basally. Peristomium slightly shorter than following segment, provided with some hyaline inclusions ( Fig. 85A); tentacular cirri similar to lateral antennae in shape; dorsal tentacular cirri slightly longer than lateral antennae, ventral tentacular cirri shorter than dorsal. Transverse row of cilia on dorsum of each segment ( Fig. 85A). Dorsal cirri of anterior 2–3 segments similar to antennae and tentacular cirri, although slightly longer. Subsequent dorsal cirri articulated, with few articles, 4–6, some of them with granular, dark inclusions. Aciculae slender, distally blunt ( Fig. 85D); enlarged aciculae on chaetigers 2–6. Compound chaetae of chaetigers 2–6 with thick shafts, short, unidentate blades, some covered by translucent hood, with slight dorsoventral gradation in length of blades within fascicle, 18 µm in length dorsally, and 11 µm in length ventrally ( Fig. 85C). Compound chaetae of subsequent chaetigers with elongate, unidentate, distally blunt blades, with short spines on margin, shafts with thick subdistal spine, and dorsoventral gradation in length within fascicle, 47 µm dorsally, 22 µm ventrally ( Fig. 85F); progressively on following segments, blades becoming slender, and tips indistinctly bidentate ( Fig. 85G). Anterior parapodia with about 6 compound chaetae, reducing to 4 on posterior parapodia. Dorsal simple chaetae from chaetiger 1, thick, distally blunt, with distal, longitudinally striated hood, similar throughout body ( Fig. 85B,E,H). Pharynx long, through about 5–6 segments, with distal crown of 10 papillae and subdistal crown of much smaller papillae ( Fig. 85A). Proventricle through about 5 segments, with 35 muscle cell rows. Pygidium small, with two long anal cirri and median short papilla.

Habitat. Occurring in algae, seagrass, sand, from intertidal to shallow depths.

Distribution. Australia (Western Australia, Victoria).