スナガニ科蟹類二種の後期幼生

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1. The description and illustration of megalopa and first crab stage of Scopimera globosa de Haan (Scopimerinae) and Paracleistostoma cristatum de Man (Macrophthalminae) were made, compared with those of other related crabs, such as Ocypoda and Gelasium (=Uca). 2. Larval stage of Scopimera globosa de Haan: Several megalopas and young crabs were obtained from the sandy beach during low tide (June 3, '55, Kamakura) and were reared in the laboratory. One of megalopas passed into the first crab stage. The megalopa has four pairs of biramous pleopods. The first three pairs of pleopods have 17〜19 swimming hairs on the exapodite and 3〜4 curled hairs on the endopodite. The last pleopod has fifteen swimming hairs. The dactylus of the fourth leg is furnished with five fine plumous hairs. The fourth leg is not so much smaller than the others. There is a tuft of hairs between the basis of the first and second legs. Morphologically the first crab stage approaches to the adult crab. 3. Larval stage of Paracleistostoma cristatum de Man: Several megalopas and young crabs were obtained from the muddy bottom of the river mouth during low tide (June 29, '55, Fujisawa, Kanaga-wa Prefecture). They were reared; one of megalopas passed into the first crab stage. The megalopa has five pairs of pleopods, the first four pairs of pleopods have 8〜12 swimming hairs on the exopodite and three curled hairs on the endopodite. The last pleopod is uniramous, having only two long swim-ming hairs. There are three feelers on the dactylus of fourth leg. The fourth leg is much smaller than the other pairs. Morphologically the first crab stage differs from the adult crab. In 1.8mm crab (carapace length), the antero-lateral border has three faint teeth, while in 2mm crab, such teeth are rudimentary. 4. Absence of the usual feelers on the dactylus of the fourth leg in megolopas of Scopimera, and reduction in number of swimming hairs on the last pleopod in megalopas of Paracleistostoma are the different point of characters from the same larval stage of Gelasimus and Ocypoda.
1958-03-15

スナガニ科蟹類二種の後期幼生

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