Studies on the Scorpaenoid Fishes of Japan. II. Statistical Observations on Sebastodes inermis (C. et V.)
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The splitting of a species of scorpaenoid fish, Sebastodes inermis (C. & V.), into four, viz., S. inermis, S. ventricosus T. & S., S. güntheri J. & St., and S. tokionis J. & St., has been adopted by several authors. On the other hand, the reduction of these four to two, namely, S. inermis and S. tokionis, was done by Jordan and Hubbs7); and even the amalgamation of all these four to one, S. inermis, was suggested by Tanaka.16) The paramount importance of an exact method of attacking the problem and an abundant supply of the material to work with is obvious. The author is greatly indebted to Dr. A. Terao and to Dr. M. Tauti for their kind guidance in applying a method, which is quite distinct from the hitherto used, to his material. He is also much obliged to the stuff of the Tyôsen Fisheries Experimental Station for a loan of specimens from Huzan to supplement his collection of the fishes from Simonoseki, Misaki, Tôkyô Bay, Bôsyû, Rikutyû and Hakodate. In passing, it may be mentioned that the specimens amounting to 198 in number were found to vary from one to seven years in age and to cover the entire range of the variations recorded by the former authors, including some intermediate forms between any two of the above-mentioned four. Osteological examinations did not reveal any point which would go to distinguish the four species. Nor were my results consistent with the view that the specimens at my disposal are referable to the two, S. inermis and S. tolkionis. It would not be sufficient to leave the argument at this stage of documentation. Still, one would insist that the four-fold splitting of the species is tenable. It is evident that one should weigh the relative value of the deviations and ascertain presence or absence of incipient tendency of divergence against the whole set of the samples if one would settle the question conclusively. It may be remarked parenthetically that the ordinary procedure anal spine, length of pectoral fin, and number of scales of lateral line, are plotted in Figs. 1-2 in reference to the body length. Table 1 tabulates the data of 3 to 5 year-old individuals which constitute the majority of the material. It is to be seen in the figures and tables that the whole material belong to one category which should go as a species. If any splitting could be admitted, it would lead to recognition of any single individual as representing each distinct species. It goes without saying that erection of several species would appear more plausible in case of fewer number of specimens examined.
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関連論文
- Studies on the Scorpaenoid Fishes of Japan. II. Statistical Observations on Sebastodes inermis (C. et V.)
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