锯缘青蟹复眼的形态和超微结构

对锯缘青蟹(Scylla serrata)的复眼做了电镜观察。扫描电镜下，半球形复眼的背面有一拇指状的无小眼区。透射电镜下，小眼为十足目短尾类特有的长六边形；复眼内小眼的感光系统包括了11个小网膜细胞(RCs)，4个RCs位于感光部分的远端，7个RCs构成了感光系统的近端主体；上下两群细胞连接处清晰显示“4 7”且有局部交错的结构。这与三疣梭子蟹和罗氏沼虾溞状幼体的文献记述相似，而与蜘蛛蟹和中华绒螯蟹的“1 7”结构不同，可能与它们对视觉依赖程度差异有关。

Morphology and Ultrastructure of the Compound Eye in the Mud Crab (Scylla serrata)

The morphology and fine structure of the compound eye in Scylla serrata was observed with electron microscopes (EM).Under the scanning EM,there was a thumb-shaped area with no ommatidia on the back of the compound eye.Under the transmission EM,ommatidia were hexagon,which are specific to Decapoda Brachyura;the sensitization system of an ommatidium included 11 retinular cells (RCs),of which four located at the distal part of the ommatidium;seven formed the proximal main part of the retina.Thus a "4 7"structure could be seen at the conjunction area,partly in overlap.These observations are in keeping with those reported for Portunus tritubereulatus and the larval of Macrobrachium rosenbergii,but different from those with the structure of "1 7" in Libinia and Eriocher sinensis.The difference may be related to the dependence of the species on the visual sense in their natural habitats.