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首页> 外文期刊>Invertebrate biology >Sperm ultrastructure in honeycomb (foam) oysters (Mollusca, Bivalvia, Gryphaeidae, Pycnodontinae): comparison with other Ostreoidea and taxonomic implications
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Sperm ultrastructure in honeycomb (foam) oysters (Mollusca, Bivalvia, Gryphaeidae, Pycnodontinae): comparison with other Ostreoidea and taxonomic implications

机译：蜂窝牡蛎（泡沫牡蛎）中精子的超微结构（软体动物，双壳纲，G科，犬齿亚科）：与其他骨纲动物的比较和分类学意义

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摘要

Sperm ultrastructural features of the honeycomb (foam) oysters Hyotissa hyotis, H. sinensis, and H. mcgintyi (Gryphaeidae) are described and compared with other Ostreoidea and more generally with other pteriomorphian Bivalvia. Spermatozoa of H. sinensis and H. mcgintyi (the type species of Parahyotissa Harry 1985) exhibit (1) a broad, low-conical acrosomal vesicle; (2) subacrosomal material (very electron-dense granular material and an almost electron-lucent axial rod); (3) a spheroidal nucleus with a wide anterior invagination (filled with subacrosomal components); (4) a midpiece composed of four spherical mitochondria surrounding a pair of centrioles (rootlet associated with proximal centriole); and (5) a flagellum. Sperm of Hyotissa hyotis (type species of Hyotissa Stenzel 1971) differ markedly from those of H. sinensis and H. mcgintyi, in having (1) a conical acrosomal vesicle showing coarse granular texture anteriorly; (2) a very electron-dense axial rod; (3) a barrel-shaped nucleus with a long, narrow anterior invagination (filled with both subacrosomal components) and a basal invagination partly housing the proximal centriole; and (4) five midpiece mitochondria and no proximal centriolar rootlet. Results indicate that H. sinensis should be relocated to another genus, possibly a revised genus Parahyotissa, and also show that the sperm of H. sinensis and H. mcgintyi show many similarities to those of the Ostreidae, with the exception that the axial rod' component of the subacrosomal material is less electron-dense than the surrounding substance (more dense in Ostreidae, as in H.hyotis). No family defining sperm features of the Gryphaeidae can be identified.
机译：描述并描述了蜂窝牡蛎Hyotissa hyotis，H。sinensis和H. mcgintyi（Gryphaeidae）的精子超微结构特征，并将其与其他Ostreoidea进行比较，更普遍地与其他翼状B科双壳纲进行比较。中华H. mcgintyi（Harry Parahyotissa的类型种，1985）的精子表现出（1）宽而低圆锥的顶体囊泡; （2）亚顶体材料（非常电子致密的颗粒状材料和几乎电子可穿透的轴向棒）; （3）球状核，具有较宽的前向内陷（充满亚顶体成分）; （4）由四个球形线粒体组成的中段，围绕着一对中心粒（与近端中心粒相关的根）。 （5）鞭毛。 Hyotissa hyotis的精子（Hyotissa Stenzel的类型种类1971）与H.sinensis和H. mcgintyi的精子明显不同，其具有（1）圆锥形的顶体小囊，其前部显示出粗糙的颗粒状纹理; （2）极高电子密度的轴杆; （3）桶形核，具长而狭窄的前向内凹（充满两个亚顶体成分）和基底向内凹，部分容纳近端中心核; （4）五个中线粒体，无近端中心小根。结果表明，中华绒螯蟹应重新定位到另一个属，可能是经修饰的伞菌属，并且还表明中华绒螯蟹和麦金泰氏精子与the科的精子有很多相似之处，但轴杆除外。顶体材料的电子组成比周围的物质少电子密度（象蛇舌草一样，在鸵鸟科中密度更大）。尚无可鉴定定义Gryphaeidae精子特征的家族。

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