瀬戸内海のChaetognath Fauna, 特にSagitta enflata及びS. crassaの分布について

概要

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(1) The chaetognath material collected in the Inland Sea of Japan comprises 9 species as follows; Sagitta crassa, S. crassa f. naikaiensis, S. enflata, S. bedoti, S. robusta, S. regularis, S. minima, Pterosagitta draco, Spadella cephaloptera. Distributions of these species are described and shown in Tables 1, 2 and 3. (2) Special attentions are paid on the distribution of S. enflata which indicates the foremost line of the influences of oceanic waters. In summer, they are restricted to the neighbouring area of entrance of Inland Sea-Bungo and Kii Channel, but in winter, they extend far inward as illustrated in Fig. 1. The reasons why the appearance of the warm oceanic species in there inward areas is restricted to rather cold time are discussed. (3) The commonest species of chaetognaths is S. crassa f. naikaiensis. In number of individuals, they are more abundant in dummer than in winter. The minimal body length of fully matured individuals is about 7mm. in summer, and about 8mm. in winter. (4) In winter, the typical and intermediate forms of S. crassa are found in the seas of Bingo Nada, Hiuchi Nada, Harima Nada and Osaka Bay. The minimal length of fully matured individuals of them is about 12mm. The formulae of armature of S. crassa of the small form in summertime and the large form in wintertime is shown in the Table 4.
社団法人日本動物学会の論文
1953-10-15