Pionosyllis hartmannschroederae (San Martin & Hutchings, 2006)

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 : 330-331

Pionosyllis hartmannschroederae n.nom.

Fig. 61A–F

Typosyllis (Langerhansia) longisetosa Hartmann-Schröder, 1990: 49 , figs 9–12.

Pionosyllis augeneri .— Hartmann-Schröder, 1991: 35. Not Hartmann-Schröder, 1979: 98.

Material examined. AUSTRALIA: NEW SOUTH WALES: Angourie Point , 29°29'S 153°22'E, algal beds, intertidal, holotype of Typosyllis (Langerhansia) longisetosa , ( HZM P-19661), paratype ( HZM P-19962) . WESTERN AUSTRALIA: Goss Passage, Beacon Is. , 28°25.5'S 113°47'E, dead coral substrate, in fine sediment at foot of reef slope, P.A Hutchings, 23 May 1994, 4 ( AM W28386) ; NE entrance to Goss Passage, Beacon Is , 28°27.9'S 113°46.7'E, terebellids on rocks in coral sand at foot of slope, 33 m, P.A. Hutchings, 25 May 1994. 1 ( AM W26455) ; inshore limestone reef, Ned’s Camp, Cape Range National Park , 21°59'S, fine sediment & sand from patches between reefs, H.E. Stoddart, 2 Jan 1984, 4 ( AM W26785) ; 5 km offshore Bush Bay , 30 km S of Carnarvon 25°10'S 113°55'E, shallow strap-leaved seagrass beds, 2 m, coll. J.K. Lowry & R.T. Springthorpe, 6 Jan 1984, 1 ( AM W28926) ; Descartes Is., Kimberleys , 14°11'S 125°40'E, sandflats & mangroves, coll. P.A. Hutchings, 20 July 1988, 1 ( AM W28397) .

Description. Body 1.4 mm long, 0.2 mm wide, with 53 chaetigers. Prostomium oval to circular, with 4 eyes in open trapezoidal arrangement ( Fig. 61A), absent in some specimens (probably lost after fixation); median antenna about two and half times longer than combined length of prostomium and palps, inserted between posterior eyes; lateral antennae slightly shorter than median antenna, inserted near anterior margin. Palps broad, longer than prostomium ( Fig. 61A). Peristomium shorter than following segments; dorsal tentacular cirri elongated, filiform, similar to median antenna, ventral tentacular cirri smaller. Dorsal cirri elongate, slender, smooth, filiform, varying in length in different specimens and in each specimen, some cirri long, several times longer than body width, and some cirri shorter than body width, alternating irregularly ( Fig. 61A). Anterior parapodia broad, becoming conical and slender from proventricle segments onwards. Ventral cirri digitiform, shorter than parapodial lobes anteriorly, elongated on posterior parapodia, longer than parapodial lobes. Compound chaetae similar throughout, including 1– 2 long, slender, filiform spiniger-like chaetae, 180 µm in length, 1–2 falcigers with bidentate blades, provided with long spines on margin, especially basally, and distal spines extending beyond level of distal tooth, straight margin of blade with convex curvature proximally then concave subdistally ( Fig. 61C), 45–47 µm in length, and about 5 chaetae with bidentae blades, with long distal spines, and short basal spines ( Fig. 61D) and dorsoventral gradation in length within fascicle, 40 µm in length dorsally, 25 µm in length ventrally. Dorsal simple chaetae from proventricle segments, with distinct, short spines on margin ( Fig. 61E). Ventral simple chaetae on posterior segments, distinctly bidentate, proximal tooth prominent, slightly longer than distal tooth, and some thin spines on margin, distal one longer than others, extending to level of distal tooth. Aciculae distally knobbed, with 2 lateral, unequal lobes ( Fig. 61F); 2 aciculae on anterior parapodia. Pharynx slender, through about 6–7 segments ( Fig. 61A). Proventricle through 4–6 segments, with about 24 muscle cell rows. Pygidium small, with 2 filiform anal cirri.

Remarks. Hartmann-Schröder described two different species named longisetosa in two different genera, on the

Distribution. Australia (Queensland, Western Australia).