カワトンボの翅の白化した個体について

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The wing colouration of a Japanese Calopterygid, Mnais strigata Selys, has been divided into four types, namely, in the males, α-type (colourless), β-type (orange), γ-type (pale orange) and δ-type (brown), and, in the females, α-type (colourless) and γ-type (pale orange) by Asahina (1956), but no record of zinc white-type. On June 25, 1961, the author encountered a female specimen having whitish wings at a stream on Mt. Tomi, Chiba Prefecture (Fig.2). Subsequently, eighty-five specimens with white wings, besides five normal-coloured specimens, were collected by Mr. Sue Nemoto and the author on Mt. Takago (Table 1, Figs. 1∿14). Another female of white type was caught by a student, Haruo Terada, on Mt. Nokogiri (Fig.2). The whitening phenomenon was recognized in ♂α-, ♂β- and ♀α-type (Fig.1, Table 1). In both sexes of α-type, the wings are zinc white whereas in the male of β-type the greater part of wings is opaque orange and only a small part of proximal side is zinc white (Fig.1). In these specimens the whitened part occupies from 1/3 to the whole of the wings (Figs. 4∿6, 8∿10, 12∿14). The whitening can be attributed to minute granules deposited between the wing-membranes (Figs.15, 17∿19). The structure of the granules seems optically and radiographically similar to that deposited in the characteristic opaque area usually found in normal ♂β-type (cf. Figs. 15∿19 and Figs. 20∿22). It seems probable that such whitening did not develop pathologically but represents a character of a rather independent colony isolated in the south-west part of Boso Peninsula. An allied colour-variation has been noted in a group of Carabid beetles, endemic to the similar part of Boso Peninsula.
日本昆虫学会の論文
1965-09-30

著者

枝重夫
東京歯科大学病理学教室

カワトンボの翅の白化した個体について

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