相模湾沿岸産カニ類(十脚甲殻,類短尾類)数種の平衡胞について

概要

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This report deals with some observations on the statocyst of six species of the brachyuran crabs collected at the intertidal rocky shores of Sagami Bay, Eriphia smithii MCLEARY (Xanthidae), Pachygrapsus crassipes RANDALL, Hemigrapsus sanguineus (DE HAAN), H. penicillatus (DE HAAN), Sesarma (Holometopus) haematocheir (DE HAAN), and S. (Parasesarma) pictum (DE HAAN) (Grapsidae). The statocyst of the crabs, mentioned-above, has a narrow external aperture, like a stripe, which runs obliquly on the dorsal surface, and it opens to the outside of the dorsal wall of the proximal segment of the antennule. In these crabs the statolith is very small in quantity and not a clump of sandgrains, cemented together, and only one or several grains (about 0.02mm in diameter) rest near the distal portion of each of the hook (or statolith) hairs which are lying in two circles on the wall of small shallow concavity at the bottom of the statocyst. The tiny statoliths may be of external origin and inserted by the crab after moulting thourth the narrow external aqerture of the statocyst and the basal segment of the antennule.
1993-03-27