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

44 Kuroshio Biosphere : BULL. BIOL. INST. KUROSHIO Vol. 1, 2004
MATERIAL EXAMINED.
Kushimoto, off Shionomisaki Cape, Wakayama Prefecture, ca. 200 m, dredge, Jan.
21, 1990, S. Nagai, collector, 1 specimen (Holotype, mature female).
Other material (?): Sabiura, Kushimoto, Wakayama Prefecture, 5m, SCUBA diving,
Aug. 16, 1996, H. Misaki, collector, 1 specimen.
DESCRIPTION.
Preserved specimen in 10 % formalin colorless except for pale brown eyes. Body 15
mm long with 50 segments. Body width 1 mm excluding parapodia, 1.8 mm including
parapodia, and 2.5 mm including setal fascicles. Prostomium hemi-circular or
sub-hexagonal, somewhat wider than long, with three antennae, paired palpi, and two pairs
of eyes (Fig. 6, A). A pair of lateral antennae 1.5 times as long as the length of
prostomium, inserted frontal margin of prostomium (Fig. 6, A). A fusiform median antenna
as long as a quater of lateral antennae, inserted frontal margin of prostomium. Palpi
bi-articulated, inserted latero-ventrally to lateral antennae (Fig. 6, A), and as long as the
latter. Two pairs of circular eyes pale brown in color, located lateral corners. Anterior pair
larger than posterior pair (Fig. 6, A). Each of anterior three segments with two pairs of
tentacular cirri. Dorsal tentacular cirri on segments I-III almost in same length (Fig. 6, A).
Fig. 6. Ophiodromus brevipodius, n. sp.
A, anterior part, dorsal view (scale by A: 1 mm); B, right 21st parapodium (with dorsal cirrus of short type),
anterior view; C, right 22nd parapodium (with dorsal cirrus of long type) anterior view; D, right 21st
parapodium, posterior view; E, Notopodial part of the same, anterior view; F, notoseta; G-I, supla-acicular
neurosetae; G, inferior; H, median; I, superior; J-L, sub-acicular neurosetae; J, superior; K, median; L,
inferior. Scale by C, B-C: 0.5 mm, D: 200 µm, E: 100 µm; F: 20 µm; G-L: 50 µm.