ヒメアカイソガニAcmaeopleura parvula STIMPSON(イワガニ科, モクズガニ亜科)のメガロパ期幼生

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The description and illustration of megalopa of Acmaeopleura parvula STIMPSON were made, as compared with those of other related crabs, such as Varuna, Eriocheir, Hemigrapsus an Gaetice (Cf. Gamo, '58). The larvae hatched from the eggs and passed through five zoeal stages in the laboratory. A megalopa emerged from the fifth zoea. The following are different points of characters from those of the same larval stage of the related crabs. 1) The dactylus of first three pairs of ambulatory legs is provided with three spines on the inner border and a stout spine on the distal end. (In Planes, Varuna and Gaetice there are teeth on the inner border of that of first three paires. In Eriocheir and Hemigrapsus there are spines on the inner border.) 2) The dactylus of fourth ambulatory leg has three feelers and a spine on the distal portion. 3) The uropod is furnished with a plumous swimming hair on the basal segment and such nine hairs on the exopod.
1960-03-15