The ultrastructure of the spermatozoon of Octopus ocellatus Gray, 1849 (Cephalopoda: Octopoda) |
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| Authors: | Jianmin Yang Weijun Wang Xiaodong Zheng Quanli Zhou Yu Zhang Guohua Sun Xiangquan Liu |
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| Institution: | YANG Jianmin 1,WANG Weijun 1,ZHENG Xiaodong 2,ZHOU Quanli 1,ZHANG Yu 1,SUN Guohua 1,LIU Xiangquan 1 1 Shandong Marine Fisheries Research Institute,Yantai 264006,China 2 Fisheries College,Ocean University of China,Qingdao 266003,China |
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| Abstract: | Morphology of the spermatozoon of Octopus ocellatus was studied by light, scanning electron, and transmission electron microscopes. Sperm are 600–700 μm long, with a large number
of granules in diameter about 130 nm. Each spermatozoon is composed of a head, neck, and tail. The head is made up of an acrosomal
complex anterior to the nucleus. The spiral acrosomal complex consists of an electron-lucent vesicle, lacuna, and an electron-dense
acrosomal vesicle. Additionally, the spiral acrosomal vesicle has numerous equidistant striations, and is surrounded by many
small granules (20 nm diameter). A long straight nucleus, which is electron-densed, has a deep posterior concavity, the nuclear
vacuole. At the terminal end of the nucleus is a sleeve-like structure with a concave posterior nuclear fossa (PNF). The neck
is short connecting the PNF. The basal body is located in the PNF and gives rise to the axoneme. This structure connects the
head, neck, and tail. The tail is divided into a middle piece and a principal piece. The middle piece, having a 9+9+2 arrangement,
is surrounded by a mitochondrial sheath and terminates by an electron-dense fibrous sheath. The principal piece is the longest
part of the sperm with coarse fibers tapering posteriorly. The results of this study shall provide some useful information
for artificial breeding of this species. |
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| Keywords: | sperm length structure acrosomal complex nucleus |
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