Haplosyllis sandii, Lattig & Martin & Martín, 2010

Lattig, Patricia, Martin, Daniel & Martín, Guillermo San, 2010, Syllinae (Syllidae: Polychaeta) from Australia. Part 4. The genus Haplosyllis Langerhans, 1879, Zootaxa 2552 (1), pp. 1-36 : 22-25

Haplosyllis sandii sp. nov.

Figs 14A–G , 15A–F

Examined material. AUSTRALIA. WESTERN AUSTRALIA: HOLOTYPE AM W36580 and 70 PARATYPES AM W36588 (2 specimens mounted for SEM), Kimberleys, south west corner of Lucas Island , 15º13'S 124º31'E, 2–30 m, coll. P.A. Hutchings, 24 July 1983 .

Additional material examined: WESTERN AUSTRALIA: 2 specimens AM W36589 , east side of Fenelon Island, Kimberleys , 14º02'S 125º43'E, 6 m, 18 July 1988 . 7 specimens AM W36590, south east end of Long Island , 28º28'48''S 113º46'30''E, 8 m, dead coral covered in coralline algae, coll. P.A. Hutchings, 22 May 1994 . 2 specimens AM W36579, north end of Long Island, Goss Passage , 28º27'54''S 113º46'18''E, 6 m, dead coral covered in coralline and brown algae, coll. C. Bryce, 22 May 1996 . NORTHERN TERRITORY: 3 specimens AM W36592, Darwin Harbour, East Point , 12°24'36''S 130°39'57''E, 7–10 m, dead coral rubble and algal washings, coll. P.A. Hutchings, 17 July 1993 .

Description. Body translucent, fragile, small, wide at proventricle level, abruptly tapering towards posterior end ( Fig. 15A ). Holotype 6 mm long, 0.5 mm wide (excluding parapodia), for 42 segments; paratypes 4–6.5 mm long for 25–41 segments; pale cream to yellowish when preserved. Scattered small, round dorsal granules on posterior segments. Pigment pattern absent. Prostomium subpentagonal, wider than long, with two pairs of small red eyes in trapezoidal arrangement ( Fig. 14A ). Median antennae inserted on middle of prostomium, between eyes (20–36 articles); lateral antennae inserted on anterior prostomial margin (11–21 articles). Palps long, longer than prostomium, broadly triangular, fused at their bases. Sensory organs in palps and nuchal organs not seen. Pharynx pale orange, extending through 5–7 segments, with long triangular anterior tooth, crown of about 10 soft papillae ( Fig. 14B ) and inner ring of cilia ( Fig. 15B ); groups of cilia make up the sensory organs on upper-ventral side of papillae. Proventricle cylindrical, dark brown, long, extending through 3–6.5 segments, broader than pharynx, with 28–36 muscle cell rows. Peristomium well defined, shorter than subsequent segments. Dorsal tentacular cirri longer than ventral ones (14–24 articles). Antennae, tentacular cirri and dorsal cirri slender. Anterior dorsal cirri relatively long, with welldefined length pattern: first longer than remaining ones (20–36 articles), second shorter (7–15 articles), third and fourth gradually longer (10–14 and 14–30 articles respectively), fifth shorter (6–12 articles) and sixth intermediate (12–20 articles). After proventricle cirri gradually decrease in length towards posterior segments, slightly alternating long (10–20) and short (4–12); median longest cirri do not exceed ½ of body width; posterior cirri short, with 1–7 articles ( Fig. 14C ). Ventral cirri digitiform, anterior ones similar or longer to parapodial lobes; median cirri gradually shorter. Chaetae all bidentate, similar throughout, 2–3 per parapodia; anterior ones slightly smaller ( Figs 14D ; 15C–D ); LMF similar in length to SW; MJP short and curved; US of MF with deep crevice and some small denticles; apical teeth long, well separated, distal tooth slightly smaller than proximal one ( Figs 14F ; 15C–F ). Aciculae with upward-directed curved tip, two in anterior parapodia ( Fig. 14E ); only one, broader than chaetae, from median to posterior segments ( Fig. 14G ). Pygidium not seen.

Reproduction. Not known.

Remarks. Haplosyllis sandii sp. nov., is characterized by the unusual deep crevice on the US of MF. It resembles H. tenhovei in body shape and cirri length, but differs in having broad, curved aciculae (which is straight in the latter), and in the absence of the marked serration on US of MF, present in H. tenhovei . The new species differs from H. ingensicola by the long cirri, the curved acicula bent at 90º, and the long MF.

Distribution. AUSTRALIA (Western Australia, Northern Territory).

Etymology. The specific name refers to Jesús Sandi, the first author husband.

Figures

FIGURE 14. Haplosyllis sandii sp. nov. A—anterior end, dorsal view; B—pharynx, showing soft papillae and anterior tooth; C—posterior end, dorsal view; D—anterior chaeta; E—anterior aciculae; F—posterior chaetae; G—posterior acicula. Scale bars: A–C = 200 µm; D–G = 20 µm. Holotype (AM W36580).

FIGURE 15. SEM micrographs of Haplosyllis sandii sp. nov. A—whole body, ventral view; B—anterior end showing pharynx, ventral view; C—chaetae from second chaetiger; D—detail of C; E—median chaetae; F—posterior chaetae. Scale bars: A = 1 mm; B = 100 µm; C, D = 5 µm; E, F = 10 µm. Paratypes (AM W36588).