甲殼類の石灰化と年令査定に関する研究-I : カニ甲殼に見られる層線の数による年令査定の可能性について

概要

論文の詳細を見る
Relationship between the number of lamellae in endocuticle and the carapace length in the shore crab, Gaetice depressus, was studied in relation to age determination of crustacean animals. 1. In spite of their molting, the number of lamellae in the newly formed and completed endocuticle was found to increase with the increment of the carapace length, irrespective of sexes. 2. Regarding the number of lamellae, 4 groups were distinguishable from one another among the specimens examined, representing a stepwise increase of 7-8 lamellae corresponding to the growth of their carapace. 3. For all their molting, the total thickness of endocuticle increases with the growth of the carapace not showing any distinct sex difference. With this total thickness of the endocuticle, 4 groups were also distinguishable from one another, though its stepwise increase was not so distinct as in the case of the number of lamellae.