Ultrastructure of the mature spermatozoon of the bivalve Scapharca broughtoni

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• 作者：Jun-Quan Zhu ; Hans-Uwe Dahms ; Wan-Xi Yang
• 关键词：Scapharca broughtoni ; Spermatozoon ; Ultrastructure ; Bivalve reproduction ; Transmission electron microscopy
• 刊名：Micron
• 出版年：2008
• 出版时间：December 2008
• 年：2008
• 卷：39
• 期：8
• 页码：1205-1209
• 全文大小：547 K

文摘

The ultrastructure of mature spermatozoa of the giant clam bivalve Scapharca broughtoni was investigated by transmission electron microscopy for the first time. The mature spermatozoon consists of a head which is composed of a cone-shaped acrosome, a round nucleus, and a tail region. A subacrosomal space contains an axial rod and a basal plate, the latter lying between the acrosome and the nucleus. Although the nucleus lacks an anterior invagination, an inverted shallow V-shaped posterior invagination is present within the nucleus. Within the middle portion of the spermatozoon lie five spherical mitochondria while the long whip-like end portion is composed of an axoneme with the typical 9 + 2 structure. Our conclusion is that the spermatozoon of S. broughtoni is of the type I anacrosomal “aquasperm”, and the morphology of acrosome and nucleus are an adaptation to external fertilization.