Odontosyllis gravelyi Fauvel, 1930

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: 292-294

publication ID

2201-4349

persistent identifier

http://treatment.plazi.org/id/038287B3-A222-FFEF-AAFE-2263FE91F83E

treatment provided by

Felipe

scientific name

Odontosyllis gravelyi Fauvel, 1930
status

 

Odontosyllis gravelyi Fauvel, 1930  

Figs 27C–F, 28A–H, 29A–F

Odontosyllis gravelyi Fauvel, 1930: 16   , figs. 3–4; 1953: 160, figs. 81–82.

Material examined. AUSTRALIA: NEW SOUTH WALES: Careel Bay, Pittwater , 33°37'S 151°19'E, Zostera   , coll. P.A. Hutchings, 4 Nov 1973 ( AM W11110 View Materials ) GoogleMaps   . QUEENSLAND: Calliope R., 23°51'S 151°10'E, coll. P. Saenger, 1974, 7 ( AM W199367) GoogleMaps   . Triangular Islets, Shoalwater Bay , 22°23'S 150°31'E, coll. J.A. Lewis & J.R. Forsyth, 1981, 10 on SEM stub ( AM W202645) GoogleMaps   .

Description. Body 14 mm long, 1.2 mm wide, with 50 chaetigers; distinct, median longitudinal black band, and large lateral spots, resembling 3 longitudinal stripes ( Fig. 28A). Prostomium small, hidden under most anterior segments ( Figs 27C, 28A–C) (probably contracted), with 2 black lateral spots and posterior transverse band; antennae short and slender, inserted in front of anterior eyes, median antenna longer than lateral antennae, inserted slightly posteriorly ( Figs 27C, 28B,C), similar to combined length of prostomium and palps. Prostomium with 2 slightly raised mounds with minute pores (see arrows Fig. 27D,E). Two densely ciliated, semi-circular nuchal organs ( Fig. 27C,D). Palps small, fused basally, ventrally folded. Peristomium

(G) long-bladed compound chaetae, midbody; (H) falcigers, midbody. Holotype

AM W11110 View Materials , except B, AM W202645. Scales: A–C,E: 0.8 mm, D: 0.2 mm, F:

0.18 mm, G,H: 20 µm.

small, dorsally nearly covered by small lobe of chaetiger 1 ( Figs 27C, 28B); tentacular cirri similar to antennae, but slightly longer. Anterior dorsal cirri elongated, smooth, distally tapered, rugose to pseudoarticulate ( Figs 27C, 28A) becoming progressively shorter along body ( Figs 27F, 28D), slightly longer than parapodial lobes. Parapodia with 2–3 parallel lobes ( Figs 27F, 28D, 29A). Ventral cirri short, pillow-shaped ( Figs 27F, 28D). Compound chaetae numerous, shafts distally spinose, and blades of 2 kinds, most dorsal ones with elongate, bidentate blades ( Fig. 28G), short spines on margin, and remaining chaetae with short, triangular, distinctly bidentate blades ( Figs 28H, 29A–E); on midbody, parapodia with about 6–7 compound chaetae of slender type, 37–45 µm in length, and 28–30 chaetae with short blades, all similar, about 16–18 µm in length; compound chaetae slightly longer on anterior parapodia ( Fig. 29A,B). Aciculae slender, distally blunt, numerous in anterior parapodia, reduced to 2–3 on posterior parapodia. Dorsal simple chaetae slender, thin, unidentate ( Fig. 29C). Ventral simple chaetae on posterior parapodia, bidentate, with short spines on margin ( Fig. 29C,F). Pharynx through 3–4 segments, with 5 teeth and 2 lateral plates ( Fig. 28F). Proventricle long, slender ( Fig. 28E), through 9 segments, with about 80 muscle cell rows.

Remarks. The small lobe on the peristomium is not regarded as an occipital flap. This species is characterized by its colour pattern, a lack of an occipital flap, and two kinds of compound chaetae being present. Odontosyllis trilineata Imajima, 2003   has a similar colour pattern and chaetae, but they differ in that O. gravelyi   also has long-bladed chaetae, and O. trilineata   has a distinct occipital flap and 9 teeth on trepan ( Imajima, 2003).

Habitat. Occurring in coarse sand and gravel and mud, shallow depths often in estuarine conditions.

Distribution. Australia (New South Wales, Queensland) and southeast India.

AM

Australian Museum

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Syllidae

Genus

Odontosyllis

Loc

Odontosyllis gravelyi Fauvel, 1930

San Martin, G & Hutchings, PA 2006
2006
Loc

Odontosyllis gravelyi

Fauvel, P 1930: 16
1930