HESIONIDAE (ANNELIDA, POLICHAETA) FROM JAPAN. I. by Hiro ...

46 Kuroshio Biosphere : BULL. BIOL. INST. KUROSHIO Vol. 1, 2004
Ophiodromus bunbuku, sp. nov.
(ブンブクオトヒメ)
(Fig. 7, Pl. 1, fig. 3)
Ophiodromus berrisfordi, Uchida, 1988, p. 78 (not Day, 1967).
───── ────, Uchida, 1992, p. 321, pl. 63, Fig. 8 (not Day, 1967).
MATERIAL EXAMINED.
Holotype: Takegashima Marin Park Area No. 2, Tokushima Prefecture, Shikoku, 5 m
deep, commensal with a Spatangoid, Brissus latecarinatus (Leske, 1778), Feb. 19, 1988, H.
Misaki, collector.
Paratypes: Kushimoto, Kamiura, lower part of intertidal zone, associated with Brissus
latecarinatus, June, 2, 1977, 1 specimen (Paratype No. 1); Kushimoto, Sabiura, 3m,
SCUBA diving, associated with Brissus latecarinatus, Mar. 21, 1982, Sh. Ui, collector, 1
specimen (Paratype No. 2); Takegashima Marin Park Area No. 2 (same record as
Holotype), Feb. 19, 1988, H. Misaki, collector, 2 specimens (Paratypes Nos. 3 & 4);
Kushimoto, Ohshima, Myogashima Islet, 25m, SCUBA diving, associated with Brissus
latecarinatus, April, 17, 1992, K. Nomura, collector, 3 specimens (Paratypes Nos. 5-7).
Other materials: Okinoshima, Tateyama, Chiba Prefecture, SCUBA diving, associated
with Brissus agassizii Döderlein, 1885, July, 7, 1995, I. Soyama, collector, 1 specimen;
Tsuruga Bay, Fukui Prefecture, the Sea of Japan, 5m, SCUBA diving, associated with
Brissus agassizii, May, 17, 1999, I. Soyama, collector, 1 specimen.
DESCRIPTION.
Holotype: Body uniformly dark brown in color (Pl. 1, Fig. 3). With 46 setigers, lost
the posterior end. 16 mm long, 3.3 mm wide including parapodia, and 1.4 mm wide
excluding parapodia. Complete paratypes 36-74 setigers, of 11-27 mm long, and of 2.0-4.5
mm wide including, and 1.2-2.0 mm wide excluding parapodia.
Prostomium hemi-circular or sub-hexagonal, wider than long, with three antennae,
paired palpi, and two pairs of eyes (Fig. 7, A-B). A pair of lateral antennae as long as the
length of prostomium, inserted frontal margin of prostomium (Fig. 7, A-B). A spherical
median antenna very short, inserted frontal margin of prostomium (Fig. 7, A-B). Palpi
bi-articulated, inserted latero-ventrally to lateral antennae (Fig. 7, A-B), and as long as the
latter. Articulation of palpi at the site of proximal 1/3. Two pairs of eyes orange in color,
located lateral corners. Anterior pair of eyes larger than posterior pair, and somewhat
elliptical in form (Fig. 7, A-B). Each of anterior three segments with two pairs of
tentacular cirri. Dorsal tentacular cirri on segments I-III almost in same length (Fig. 7, A-
B). Ventral tentacular cirri on those segments somewhat shorter. Pygidium with a pair of
long anal cirri (Fig. 7, D).
Parapodium sub-biramous. Each parapodium with a dorsal cirrus, a neuropodial cone,
and a ventral cirrus (Fig. 7, E-F). Notopodial part of the median parapodium with a
cirrophore and a pseudo-articulated cirrostyle. The articulation of cirrostyle rather clearly in
distal part (Fig. 7, E).
Notopodial cirrophore very long, without constriction. Each notopodium with two