Opisthosyllis japonica Imajima, 1966

Martín, Guillermo San, Hutchings, Pat & Aguado, María Teresa, 2008, Syllinae (Polychaeta, Syllidae) from Australia. Part. 2. Genera Inermosyllis, Megasyllis n. gen., Opisthosyllis, and Trypanosyllis, Zootaxa 1840, pp. 1-53 : 26

publication ID

1175­5334

persistent identifier

https://treatment.plazi.org/id/6B1B87FB-F20A-8B06-FF67-FDAFFC81F88D

treatment provided by

Felipe

scientific name

Opisthosyllis japonica Imajima, 1966
status

 

Opisthosyllis japonica Imajima, 1966 View in CoL

Figs 17C–F, 18A–I, 19A–F, 20A

Opisthosyllis japonica Imajima, 1966b: 226 View in CoL , text-fig. 40 a–p.– Hartmann-Schröder 1980: 48, figs 27–32.

Material examined. AUSTRALIA, WESTERN AUSTRALIA: Kimberley region, reef S of Lucas Island, Brunswick Bay , 15° 16'S, 124° 29'E, 2 m, coll. P.A. Hutchings, 24 Jul 1988, 2 (1 SEM), ( AM W31383) GoogleMaps ; East Montalivet Island , 15° 06'S, 125° 18'E, 6 m, coll. P.A. Hutchings, 16 Jul 1988, 1 ( AM W31381) GoogleMaps ; Condillac Island , 14° 06'S, 125° 33'E, 6 m, sand with scattered bommies, coll. P.A. Hutchings, 16 Jul 1988, 1 ( AM W31382) GoogleMaps .

Description. Longest specimen, 10 mm long, 0.5 mm wide, 71 chaetigers, colourless; Japanese specimens up to 40 mm, 1.3 mm wide, 173 chaetigers (fide Imajima, 1966b). Prostomium oval, partially covered by peristomium; 4 large eyes in trapezoidal arrangement ( Fig. 18A). Median antenna inserted between anterior eyes, longer than combined length of prostomium and palps, with about 30 articles; lateral antennae inserted in front of anterior eyes, shorter than median antenna, with 15–17 articles ( Fig. 18A). Palps broad, similar in length to prostomium. Peristomium similar in length to following segments; dorsal tentacular cirri with 35 articles, longer than antennae and ventral tentacular cirri (with about 15 articles). Dorsal cirri of chaetiger 1 distinctly longer, with 50–56 articles, following ones, alternating long (25–30 at midbody) and short (13–15 articles). Antennae and tentacular and dorsal cirri slender, whip-shaped ( Figs 17C, D, 18A). Ventral cirri digitiform, shorter than parapodial lobes. Parapodia distally bilobed, with pre- and post-chaetal lobes ( Fig. 18A), pre-chaetal lobe digitiform, longer than post-chaetal ( Figs 17D–E, 18A). Anterior compound heterogomph chaetae, 10–15, short, falcigerous bidentate blades (21 µm dorsally to 13 µm ventrally), small proximal tooth and short spines on margin ( Figs 17E, F, 18B, 19A), number of chaetae progressively decreasing posteriorly, as shafts becoming thicker, sub-distally enlarged, and blades becoming shorter, unidentate, with few, short spines on margin ( Figs 18E, H, 19B–D); 1 (sometimes 2) dorsal chaeta on each parapodium loosing blade and becoming thick, forming simple chaeta ( Figs 18D, G, 19B, D, 20A). Posterior parapodia with 1–2, simple and 3–5 compound thick chaetae with sub-distally enlarged, smooth shafts and short unidentate blades ( Figs 18G, H, 19E, F, 20A), 23– 20 µm long, with 2–4 short straight spines. Anterior aciculae 2–3, slender, one straight, other distally broad ( Fig. 18C), decreasing progressively ( Fig. 18F) to solitary, distally rounded acicula from mid-posterior parapodia ( Fig. 18I). Pharynx long, starting at chaetiger 2–3, extending through 7–8 segments; pharyngeal tooth located near posterior end of pharynx ( Fig. 18A). Proventricle similar in length or slightly shorter to pharynx, through 5–6 segments, with 55–60 muscle cell rows. Pygidium not seen.

Habitat. Sand, algae, coralline concretions, ascidians; intertidal and shallow substrates.

Distribution. Japan, Australia (Western Australia).

AM

Australian Museum

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Syllidae

Genus

Opisthosyllis

Loc

Opisthosyllis japonica Imajima, 1966

Martín, Guillermo San, Hutchings, Pat & Aguado, María Teresa 2008
2008
Loc

Opisthosyllis japonica

Hartmann-Schroder, G. 1980: 48
Imajima, M. 1966: 226
1966
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