日本初記録の深海性アシロ科魚類イシフクメンイタチウオ（新称）Bassozetus robustus

抄録

Two specimens of the robust assfish, Bassozetus robustus Smith and Radcliffe, 1913 (84.1 and 341.9 mm in standard length, SL), collected from Suruga Bay and the continental slope of the Ryukyu Trench, respectively, represent the first records of the species from Japanese waters. Bassozetus robustus is distinguished from all congeners by the following combination of characters: dorsal fin rays 112－130, anal fin rays 92－103, pectoral fin rays 24－28, precaudal vertebrae 13-16, long gill rakers on first gill arch 11-16, oblique scale lows between anus and dorsal fin 25－36, pelvic fin length 16.5－20.5% SL, body depth at anal fin origin 10.0－19.0% SL, a well-developed basibranchial tooth patch and inner surface of sagittal otolith with an ostial channel. The new Japanese name “Ishi-fukumenitachiuo” is proposed for the species.