本邦に見出されたobscura群猩々蠅

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In the summer of 1951, the authors succeeded in collecting about 800 flies (about 160 females), belonging to the "obscura" group of Drosophila, at several localities in Hokkaido (Akkeshi and five others) and one locality in the northern part of Honshu (Mt. Hakkoda). This collection was planned in order to search for some wild Drosophila, especially of this group, in Japan, according to Professor DOBZHANSKY'S valued advice, of which we wish to record here our grateful appreciation. It seems that these flies are not domestic but wild, living in the forest at some distance from human habitations, similarly to the known species of this group. The diurnal behaviour was observed, although for only one day at Akkeshi, with the result that they were found to appear most in the early morning, not showing another peak before sunset as has been observed in some experiments on D. pscudoobseura. These flies were at first thought to form one species, belonging to the "obscura" rather than to the "affinis" subgroup, although the identification was not established exactly. This Japanese species was compared with nine species of the "obscura" subgroup; namely, pseudoobscura, persimilis, miranda, obscura, subobscura, obscuroides, tristis, bifasciata and ambigua, with regard to several characteristics such as male sex-combs, principal parts of male genitalia-9th tergite, 10th sternite, and basal plate of apodeme of ejaculatory bulb, and karyotype. Then it was found that the present species was most similar to D. bifasciata, since no difference could be recognized between them, so far as these characteristies were concerned. However, more details, including the ctossability, must be pursued, before the accurate identification will be attained. Recently, thanks to the cooperation of DOBZHAMSKY and BUZZATI-TRAVERSO, almost all the species of the "obscura" subgroup have been got together. Using them, an effort will be made to clarify the situation of the Japanese species among Nearctic and Palaearctic species of this subgroup, and to furnish maierials for genetical investigations of the natural populations of Japanese Drosophila.
社団法人日本動物学会の論文
1952-10-15

本邦に見出されたobscura群猩々蠅

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