日本産普通多足類の後胚発生XI : ヒラタヤスデの生活史(1)

概要

論文の詳細を見る
The subject of the present study was to elucidate the life history of Bazillozonium nodulosum in its natural habitat and under breeding. 1) The species is commonly found in cryptomeria forest. Seasonal activity usually begins in the early part of May and continues to the end of October. During an inactive period, a great number of individuals are found in damp places under small rocks, rotten leaves and wood, etc., as well as inside barks of rotten stumps (Fig. 2). 2) About 1500 hibernating individuals were collected in 1959-1962, and were analysed according to the number of their body segments. The results are shown in figure 1. The natural population in hibernation is composed of individuals in various developmental stages, and the relation between the number of individuals and of body segments appear as six main groups (Fig. 1, A-F). In hibernation, the sex ratio is nearly 1: 1(Table 1). 3) Egg-laying under laboratory conditions was observed. The female lays her eggs, which are immediately received by a male (with 40 or more body-segments). The eggs are brooded by the male until hatching (Figs. 4 and 5). The number of eggs per male varies between 23-78 and usually avarages 40-60 (Table 2). The period of egg-laying usually extends from the middle of May to end of July, with intensified breeding in the end of May. Brooding of Colobognatha Diplopods is at present known in the following four species. Female brooding Polyzonium germanicum BRANDT (Europe) Orsiboe ichigomensis ATTEMS (Japan) Male brooding Bazillozonium nodulosum VERHOEFF (Japan) Brachycybe lecontei WOOD (North America N. B. Causey, private letter)
1962-08-15

日本産普通多足類の後胚発生XI : ヒラタヤスデの生活史(1)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク