蚌科钩介幼虫比较形态学研究──Ⅰ.四个种幼虫的形态
A COMPARATIVE STUDY ON GLOCHIDIAL MORPHOLOGY OF UNIONIDAE (BIVALVIA)──Ⅰ.Unio douglasiae, Cuneopsis pisciulus, Acuticosta chinensis and Acuticosta ovata
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摘要: 本文报道圆顶珠蚌、鱼尾楔蚌、中国尖嵴蚌、卵形尖嵴蚌育儿囊的特点和钩介幼虫的形态。应用光镜和扫描电镜对四种蚌的钩介幼虫形态进行了观察和比较。结果表明,四种蚌的育儿囊均为外鳃类的同生型,钩介幼虫为有钩型,幼虫的大小、形状、壳表面、壳钩、棘刺、幼虫丝、感觉毛等在不同种之间存在着差异。文中对这些特征在分类上的意义进行了讨论。Abstract: Glochidial morphology of four unionid species, Unio douglasiae (Gray),Cuneopsis pisciulus (Heude), Acuticosta chinensis (Lea) and A. ovata (Simpson), was studied tinder optical and scanning electron microscope (SEW). Specimens were all collected from Poyang Lake of Jiangxi Province.In adults of the four species, only outer demibranchs are used as marsupia, in which U. douglasiae and A. chinensis form conglutination whereas C. pisciulus and A. ovata have separate embryos. In comparison of the glochidia, significant differences were found among the species. A. chinensis differs from the others by having gourd-shaped shell and numerous delicate spines on the hooks. C. pisciulus has fine,concentric wrinkles on the ventral margin and obviously long hooks. A. ovata and U.douglasiae are similar to each other in shell shape, however, the former has pores on the shell-surface and the latter has only shallow pits. Sensory hairs of glochidia were observed to have three pairs in U. douglasiae and A. chinensis, and four pairs in C.pisciulus. No sensory hair was found in A. ovata, probably due to long preservation.
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Keywords:
- Unionidae /
- Glochidium /
- Morphology
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