On an Ophidioid Fish, Petroschmidtia toyamensis KATAYAMA, with some Remarks on the Genus Petroschmidtia
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概要
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The genus Petroschmidtia was established by Taranetz and Andriashev (1934:507) for the accommodation of their new species P. albonotata taken from the Okhotsk Sea. In 1941 an another species, P. toyamensis. was added to this genus by Katayama (1941: 593, fig.) based upon a specimen obtained from Toyama Bay. Several specimens of the latter have since been obtained by the sane author (Katayama, 1940:330;1949:73) from Toyama Bay, and off Tsuiyama, Hyogo Prefecture, both in the Japan Sea. Recently we obtained 25 specimens of the outstanding species identical with P. toyamensis, varying from 100.5 to 402.0mm in total length, from Toyama Bay, and off Tsuiyama, Hyogo prefecture. These were taken at a depth of about 125 fathoms by means of deep-sea trawlers, and they are now deposited in the Fisheries Dept., Faculty of Agr., Kyoto University. Upon careful examination of these specimens we found some remarkable variations between them due to their age and sex. We, therefore, fully treated this fish in order to make out these differen-ces satisfactorily as well as to supplement the rather brief original description of this species. The genus Petroschmidtia is closely related to Lycodes. a genus of Zoarcidae, and is apparently an off-shoot of that genus. For establishing the genus Petroschmidtia to accommodate P alb-onotata, Taranetz and Andriashev (1934:510) wrote “The genus, Petroschmidtia differs from the genera Lycodes Reinh. and Aprdon Gilb. by the absence of teeth on the vomer as well ac on the palatines and also by the absence of pyloric coeca”. Besides these differences, we found a remarkable difference in structure of pelvic fins between these genera, as it will be seers later on. The various parts of a body were measured in the same way as the senior writer had done in his previous studies on the scorpaenoid fishes of Japan (Matsubara, 1943:6-7). In the present study we carefully observed the pelvic fins, teeth on jaws and gill-rakers by staining with alizarin red, and clearing with potassium hydroxide. We wish to express our hearty thanks to Mr. Hachiro Kinoshita of Uozu, Toyama prefecture and prof. Masao Katayama, of Yamaguchi University, for their kindness in supplying us some of the specimens which we used in the present study. Through the courtesy ofthe latter, it has been possible to re-examine the holotype and to make an evaluation of this species. The expenses for pursuing the investigaton of this work were defrayed by a grant of the Ministry of Education.
著者
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MATSUBARA Kiyomatsu
Fisheries Dept., Faculty of Agr., Kyoto Univ.
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IWAI Tamotsu
Fisheries Dept., Faculty of Agr., Kyoto Univ.