Erinaceusyllis serratosetosa (Hartmann-Schröder, 1982), Guillermo San Martin, 2005

Guillermo San Martin, 2005, Exogoninae (Polychaeta: Syllidae) from Australia With the Description of a New Genus and Twenty-two New Species, Records of the Australian Museum 57, pp. 39-152 : 79-80

Erinaceusyllis serratosetosa (Hartmann-Schröder, 1982) n.comb.

Fig. 34A–F

Sphaerosyllis erinaceus serratosetosa Hartmann-Schröder, 1982: 70 , figs. 57–59; 1983: 134; 1990: 54; 1991: 39.

Sphaerosyllis erinaceus (not Claparède).–Hartmann-Schröder, 1979: 102; 1980a: 54.

Material examined. AUSTRALIA: QUEENSLAND. 2 specimens, AM W26703, Triangular Islets, Shoalwater Bay, 22°23'S 150°31'E, J.A. Lewis & J.R. Forsyth, 1981. 1 specimen, AM W26940, Hinchinbrook Channel, 18°20'S 146°4'E, tidal flats (mud & sand), S. Dittmann, 14 Oct 1989. 1 specimen, and 2 specimens on SEM stub, AM W26941, Hinchinbrook Channel, 18°20'S 146°4'E, tidal flats (mud & sand), S. Dittmann, 22 Oct 1991. 1 specimen, AM W26942, Hinchinbrook Channel, 18°20'S 146°4'E, tidal flats (mud & sand), S. Dittmann, 20 Oct 1991. NEW SOUTH WALES. 1 specimen, AM W11109, Careel Bay, Pittwater, 33°37'S 151°19'E, in Zostera beds, P.A. Hutchings, 30 July 1973. 1 specimen, AM W23549, Weeney Bay, Botany Bay, 34°01.3'S 151°09.7'E, mud, 1 m, A. Roach & A. Jones, 30 Mar 1995. 5 specimens, AM W23550, Weeney Bay, Botany Bay, 34°01.3'S 151°09.7'E, mud, 1 m, A. Roach & A. Jones, 30 Mar 1995. 6 specimens, AM W23551, Weeney Bay, Botany Bay, 34°01.3'S 151°09.7'E, mud, 1 m, A. Roach & A. Jones, 30 Mar 1995. 4 specimens, AM W23559, Weeney Bay, Botany Bay, 34°01.3'S 151°09.7'E, mud, 1 m, A. Roach & A. Jones, 30 Mar 1995. WESTERN AUSTRALIA. PARATYPES: 2 specimens, AM W18556, Cervantes, 30°30'S 115°03'E, fine sand among Posidonia , intertidal, G. Hartmann-Schröder, 24 Oct 1975. 1 specimen, AM W26833, Bush Bay, 30 km south of Carnarvon, 25°10'S 113°39'E, on shallow sand flats, 0.5 m, J.K. Lowry & H.E. Stoddart, 6 Jan 1984.

Description. Body small to minute, up to 2.5 mm long, 0.14 mm wide, up to 34 chaetigers, usually smaller, provided with small, scattered papillae (Fig. 34A). Prostomium oval to pentagonal; 4 large eyes in trapezoidal arrangement, nearly in line, and 2 anterior eyespots; antennae with bulbous bases and short tips; median antenna similar to combined length of prostomium and palps, inserted slightly anteriorly to posterior eyes; lateral antennae shorter than median antenna, inserted on anterior margin, slightly posterior to eyespots. Palps shorter than prostomium, fused along their length. Peristomium shorter than following segments, covering dorsally posterior margin of prostomium, sometimes trilobed (Fig. 34A); tentacular cirri similar to antennae but smaller. Dorsal cirri shorter than antennae, longer than tentacular cirri, with bulbous bases and short tips, absent on chaetiger 2 (Fig. 34A). Parapodia rectangular to conical, with a distal papilla and, sometimes, other smaller distal papilla. Compound chaetae heterogomph, shafts marginally smooth or provided with short subdistal spines; blades elongate, unidentate, distally slightly hooked, margin provided on bases with long, erect spines, especially long on longer blades, short spines on middle, smooth on distal third (Fig. 34C); parapodia each with 1–2 compound chaetae with long, spiniger-like blade, about 52 µm on midbody, and 9 on anterior, 6 on midbody, 3 on posterior parapodia, similar but much shorter, with dorsoventral gradation, 26– 16 µm on midbody. Dorsal simple chaetae from anterior parapodia, usually from chaetiger 1, unidentate, provided with short marginal spines (Fig. 34D). Ventral simple chaetae slender, smooth, unidentate (Fig. 34F), on posterior parapodia. Acicula solitary, acuminate (Fig. 34E). Pharynx proportionally long and slender, through 4 segments; pharyngeal tooth small, near opening (Fig. 34A). Proventricle long and wide, barrel-shaped, through 4 segments, with about 22 muscle cell rows. Pygidium small, with two anal cirri similar to dorsal cirri but longer, and a median papilla (Fig. 34B).

Distribution. Australia (Western Australia, Queensland, New South Wales). Recently reported a single specimen from Western Mediterranean (San Martín, 2003).

Habitat. Sand, mud, on seagrasses, in shallow water.