カイカムリ科3種のゾエア幼生

概要

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Larvae of three species of Japanese sponge-crabs, Dromia dehaani Rathbun, Petalomera japonica (Henderson) and P. wilsoni (Fulton and Grant)(Dromiidae) were reared in the laboratory, from hatching to the last zoeal stage or megalopa stage. They were fed Artemia salima (L.) nauplii. The first species passed through four zoeal stages, but the other two only two, before reaching the megalopa stage. The larvae of these species are described and illustrated herein, and compared with descriptions of zoeae of five dromiid crabs so far reported in the literature. In the zoeal stages, the eight dromiid species may be distinguished from one another by the presence or absence of carapace spines, the ratio of the lenght of the rostral spine to that of the antennal scale and the endopodial setation on the mxilla II. The dromiid zoeae show some characteristics associated with anomuran zoeae. The endopodial setations on the maxilla I and maxilla II may be of phylogenetic significance, since intermediate stages of transformation from Dromiidae to Xanthidae are manifested.
1983-09-25