蚌科钩介幼虫的比较形态学研究Ⅱ.六个种幼虫的形态

研究了真柱矛蚌、剑状矛蚌，洞穴丽蚌、角月丽蚌、三解帆蚌、褶纹完蚌等六种蚌的育作囊的类型和钩介幼虫的形态，应用光镜及扫描电僮对钩介幼虫的形态结构进行了观察和比较。结果表明 柱矛蚌、剑状矛蚌、三角帆蚌、褶纹冠的育儿囊为外鳃类同生型，洞穴丽蚌、角月丽蚌的育儿囊为外鳃类四生型、钩介幼虫可为二类：真柱矛蚌、剑状矛蚌、褶 纹冠蚌为有钩型，三角帆蚌、油穴丽蚌、角月丽蚌为无钩型。一些细微结构在不同种之间也存在着差

A COMPARATIVE STUDY ON GLOCHIDIAL MORPHOLOGY OF UNIONIDAE (BIVALVIA)

Glochidia of six unionid species, Lanceolaria eucylindrica Lin, L gladiola (Heude), Lamprotula caveata (Heude), L cornuumlunae (Heude), Hyriopsis cumingii (Lea), Cristaria plicata (Leach), were studied under optical and scanning electron microscope (SEM). The materials for the study were derived from mature shells collected from Poyang Lake, Jiangxi Province in 1996-1997.The marsupia f adult Lamprotula caveata and L. cornuum-lunae are formed by joining all four demibranchia while those of the other species are formed merely with two outer demibranchia. The conglutination was observed only in two Lanceolaria species. The differences in glochidia among species are obvious. The glochidia of Lanceolaria eucylindrica, L. gladiola and C. plicata are hooked, and the rest are hookless. In the hooked forms, the glochidia of C. plicata are obviously large and each has four pairs of sensory hairs. The other two species have three pairs of sensory hairs, but L. gladiola differs from L. eucylindrica by having asymmetric shells.All hookless glochidia have semi-elliptical appearance. However, the shell surface of Lamprotula caveata has shallow pits while those of the other two have pores. Sensory hairs are also different in number. Four pairs were observed in Lam. caveata and Lam.cornuum-lunae, but only two pairs were found in H. cumingii.