锯缘青蟹雄性腹肢的结构和功能

于2000年6月至2002年10月,采用扫描电镜方法对锯缘青蟹（Scylla serrata）雄性附肢结构进行观察。结果表明,青蟹雄体输精管在第八胸节通向一个短的肌肉质的阴茎开口。第一腹肢由一个基部原肢和一个延长的内肢组成,表皮环包,形成一个交接管。第二腹肢吻合这个表皮管,而阴茎则放在内肢的基部侧面。交配时,阴茎在肌肉作用下,精液射到第一腹肢的射精管中,射出物在第二腹肢的活塞样的泵作用下,沿着管腔向里推进。第一腹肢顶端侧扁状、具侧缝,前部表面具棘突状和腺体孔,弯曲部棘较大。侧缝处具细长的棘和羽状刚毛,刚毛基部为杯状凹陷。

The structure and function of male gonopod of Scylla serrata

Structure and function of the gonopod in mud crab, Scylla serrata, were studied with electron microscope techniques from June 2000 to December 2002. The ejaculatory duct of Scylla serrata opens on the coxae or sternum of eighth segment by short muscular penis. The first gonopod consists of a basal protopodite and an elongated endopodite, in which the cuticle folded the entire length of a tube which functions as an ejaculatory canal. The second pleopod fits into this cuticular fold,while the penis fits into a slit on the lateral side at the base of the endopodite. During coitus, seminal fluid is ejected by muscular action through the penis into the ejaculatory canal of the first pleopod. The ejaculate is further pushed down the canal by the pumping and inner folds and form the lateral slot. Several types of setae are quite conspicuous on the first and second gonopod. There are also some long processes and setae on the lateral slot. Pinnate setae are present on the medial and lateral margins of the basal part of the endodite and the protopodite. The pinnate setae are inserted via a characteristic annular insertion.