On the Zoea Larvae of Four Crabs of the Family Hymenosomidae
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概要
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The present paper discusses the larval development of Halicarcinus orientalis Sakai, Rhynchoplax messor Stimpson, R. coralicola Rathbun, and Elamena truncata Stimpson, under laboratory conditions. In all of these, the zoea comprises three stages. Its carapace, globular in shape, has a blunt rostral spine, but neither dorsal nor lateral spines, the telson and antenna II fall in Aikawa's, types D (1929), the antennae I and II lack endopod, and the coxa of maxilla II is vestigial, ending in a long seta. In R. messor, the protopod of maxillipede I has four groups of setae, consisting respectively of three, two, two, and two, from top to base, in contrast to three, three, two, and two of the others. In H. orientalis, the endopod of maxilla II carries four setae on the outer lobe and two on the inner, whereas that of the others bears three on the former and two on the latter. As regards the limbs which undergo changes with development, the four species are alike in that maxilla I bears five apical setae on the basis in stage I, and seven in the succeeding two stages, and in that the pereiopods emerge as biramous rudiments in stage I, showing more or less similar growth rates. (Zool. Mag. 86: 174-184, 1977)
- 社団法人日本動物学会の論文
- 1977-09-25