コメツキガニとチゴガニの後期発生の比較

概要

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The larvae newly hatched from the embryos of the barried females of Scopimera globosa de Haan and Ilyoplax pusillus (de Haan) taken at the estuary of the River Oota, Shizuoka Prefecture, in June, 1974, were reared up to megalopa stage and the entire course of development was studied in each species. The whole course comprises fove zoeal and one megalopa stages. In scopimera, antenna II of the zoea belongs to the C_2-type, whereas in Ilyplax it belongs to the C_1-type. Natatory setae of maxillipedes I and II increase following the formula, 2×(S+1), where S represents the ordinal number of the zoeal stage. The telson becomes distinctly articulated in stage IV. Simple setae on the coxopod of maxilla I and plumose ones on the scaphognathite of the maxilla II, both of which are constant in their numbers through the first three stages, increase during the last two stages from 5・0(5) through 7・0(7) to 7・0(7) in the former, and from 4.1(5) through 5・3(8) to 8・5(13) in the latter. The chief difference between the megalopae of the two species lies in the number of long aesthetes on segments VI and VII of antenna II (in Scopimera 2-2, in Ilyplax 0-3).
社団法人日本動物学会の論文
1976-03-25