モエビ(クルマエビ科)を新種とすることについて
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概要
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The present author has had of late an opportunity to examine 7 specimens of Metapenaeus affinis(H. Milne-Edwards) trawled in October, 1953, from creeks near Karachi, India, and found that the Indian form differs mostly on sexual organs from the Japanese form known under the same name. The differences are so considerable as to erect a new species on the Japanese form. In the meantime, Burkenroad (1934), on the Japanese form in question, first mentioned that "Kishinouye's figure of this structure (thelycum) in M. affinis differs so considerably from the figures by De Man, 1924, and Alcock, 1906, as to make doubtful a reference merely to age differences." Hence the specific name. The new species, M. burkenroadi, recorded in this article easily separable from M. affinis (H.Milne-Edwards) in the following respects: The petasma of M. burkenroadi is cross-shaped in general feature having a pair of thumb-like projections on distal median border of the dorsal lobes(Fig. 1, A, B), while that of M. affinis is Y-shaped with a pair of petaloid lobes on the disto-median edge of the dorsal lobes (Fig. 1, E, F). The thelycum consists of a pair of eleva tions ox-hornshaped in outline and flattish on ventral surface in M. burkenroadi (Fig. 1, C). But that of M. affinis is made up of 2 pairs of rather thick lobes on the last thoracic sternum and a tongue-like median process arising from a position near anterior rim of the eighth thoracic segment(Fig. 1, H).
- 社団法人日本動物学会の論文
- 1955-01-15
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