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

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42 Kuroshio Biosphere : BULL. BIOL. INST. KUROSHIO Vol. 1, 2004 1.7 times as long as prostomium. Palpi bi-articulated, inserted nearby lateral antennae, and a little longer than the prostomium (Fig. 5, B). Articulation of palpi at the site of less than proximal 1/4. Two pairs of eyes located lateral corners. Anterior pair of eyes larger a little than posterior pair (Fig. 5, B). Each of anterior three segments with two pairs of tentacular cirri. All dorsal tentacular cirri almost in the same length, and ventral tentacular cirri somewhat shorter than dorsal ones. Anal cirri long and slender. Parapodium uniramous. Each parapodium with a dorsal cirrus, a neuropodial cone, and a ventral cirrus (Fig. 5, C-D). Notopodial part of the median parapodium with a cirrophore and a cirrostyle. Notopodial cirrophore long, spread out over the level of outer margin of neuropodial postsetal lobe. Notopodial cirrophore with a conspicuous constriction near the distal end. At the constriction, the diameter of the cirrophore markedly decrease, and distal part of cirrophore being somewhat thicker than or almost same thickness as its cirrostyle. Notopodial cirrostyles rather short. Each notopodium with 1-3 acicula. The tips of acicula penetrate to the surface of the cirrophore near the constriction, where an Fig. 5. Ophiodromus berrisfordi A, anterior part, dorsal view (scale by A: 1 mm); B, prostomium; C, left 21st parapodium (with dorsal cirrus of short type), anterior view; D, left 22nd parapodium (with dorsal cirrus of long type), posterior view; E, notocirrus constriction of left 34th parapodium, showing 3 noto-acicula; F-H, supla-acicular neurosetae of 22nd parapodium; F, superior-most; G, median; H, inferior; I-K, sub-acicular neurosetae of left 21st parapodium; I, superior-most; J, median; K, inferior-most. Scale by B, B: 1.7 mm, C-D: 1 mm, E-K: 100 µm.
UCHIDA : HESIONIDAE (ANNELIDA, POLICHAETA) FROM JAPAN. Ⅰ. 43 inconspicuous mound formed (Fig. 5, E). Without notosetae. Each median neuropodium with a single or 2 acicula. The tip of a single aciculum penetrate to the presetal lobe of neuropodium. Neuropodial presetal lobe with a long triangular projection (Fig. 5, C-D). Neuropodial postsetal lobe low and not conspicuous (Fig. 5, D). With ca. 35 supla-acicular and ca. 45 sub-acicular setae in median neuropodia. Neurocirri long subulate in form, rather small and slender comparing with other species of the genus. Neurocirri inserted far inside from the ventro-lateral corner of parapodia, with rather clear cirrophores (Fig. 5, C-D). Neuroseta with rather long terminal piece of narrow blade (Fig. 5, F-K). Serration of blade very fine. Superior sub-acicular setae with long blade (Fig. 5, I), and shown that this species belongs to the group of long type neurosetae. REMARKS. The species with characteristic long notopodial cirrophores. The species somewhat resembles to O. angustifrons (p. 39), but O. angustifrons with short palpi, and without conspicuous constriction on notopodial cirrophores. The species also somewhat resembles to O. constrictus, n. sp. (p. 48), but O. constrictus with rather short notopodial cirrophores, and also devoid of long blade setae in sub-acicular group of neuropodia (short setae type). The species also resembles to O. fauveli, n. sp., but without notosetae and also without color bands. The present materials coincide very well with the species mentioned above. Small median antennae, the site of articulation of palpi, short notocirri, long notopodial cirrophores, remarkable constriction on notopodial cirrophores, long triangular presetal lobe of parapodia, remarkable cirrophores of neurocirri projecting from the distal parapodial ventral line, and plural number of notopodial acicula. These factors are common to the description (incl. figures) of O. berrisfordi and present materials. The type locality, the Atlantic coast of South West Africa, is rather far from our localities (northeastern edge of the Indo-West Pacific region), but I regard my materials as the same species form the Atlantic southern Africa. Parasyllidia humesi Pettibone, 1961 is very similar to this species. The body size and the locality are also near. The collector, Dr. A. G. Humes is the copepod taxonomist of commensal Cyclopoid, associated with many groups of Invertebrates. His method for collecting copepods is, unfortunately, rather rude for the delicate Hesionids. It is probable that the almost specimens lost their fragile median antennae during the treatment for copepods. Other species with long notopodial cirrophores is Nereimya blacki Knox, 1960, but the species with many notosetae, spread from the constriction of notopodial cirrophore. N. blacki is surely a member of the genus Ophiodromus. The 2 type specimens of Ophiodromus blacki (Knox, 1960), n. comb., undoubtedly lost their easily detachable median antennae, during collection or treatment after collection. Ophiodromus brevipodius, sp. nov. (Fig. 6)
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