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

40 Kuroshio Biosphere : BULL. BIOL. INST. KUROSHIO Vol. 1, 2004
D). Notopodial cirrostyles rather short. Each notopodium with a single aciculum. The tip of
aciculum approached to the surface of the cirrophore near the constriction. Without
notosetae. Each median neuropodium with a single aciculum. Neuropodial presetal lobe
with a long triangular projection (Fig. 4, C-D). Neuropodial postsetal lobe low and
rounded and not conspicuous (Fig. 4, D). With ca. 16 supla-acicular and ca. 18
sub-acicular setae in median neuropodia. Neurocirri long subulate in form, inserted from
somewhat to the ventro-lateral corner of parapodia (Fig. 4, C-D).
Neuroseta with rather long terminal piece of narrow blade (Fig. 4, F-J). Serration of
blade very fine and almost smooth. Superior sub-acicular setae with long blade (Fig. 4, D,
J).
REMARKS.
The elliptical prostomium, rather large eyes, rather long notopodial cirrophore, with
gradually reduced constriction, rather short notopodial cirrostyle, long neuropodial presetal
lobe, and insertion of neurocirrus far apart from the latero-ventral corner of the
neuropodium, are all resemble to the figures of original description (Grube, 1878, Taf. VI,
figs. 7, 7a, Taf. XV, fig. 12). The locality of the present material, furthermore, is the
Yaeyama, southern-most part of Japan, and true coral reef region, and closely near the type
Fig. 4. Ophiodromus angustifrons
A, anterior part, dorsal view (scale by A: 1 mm); B, prostomium; C, right 15th parapodium, anterior view; D,
right 20th parapodium, posterior view; E, notopodial aciculum; F, median supla-acicular neuropodial falciger in
right 15th parapodium; G, inferior-most supla-acicular falciger in the same parapodium; H, inferior-most
sub-acicular falciger in the same parapodium; I, inferior sub-acicula falciger; J, superior sub-acicular falciger.
Scale by D, B-C: 500 µm, D and F-H: 200 µm, E and I-J: 50 µm.