Spermiogenesis and Taxonomical Values of Sperm Ultrastructures in Male Crassostrea ariakensis (Fujita & Wakiya, 1929) (Pteroirmorphia: Ostreidae) in the Estuary of the Seomjin River, Korea
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Characteristics of the developmental stages of spermatids during spermiogenesis and phylogeneticclassicfication of the species using sperm ultrastructures in male Crassostrea ariakensis were investigated by transmissionelectron microscope observations. The morphology of the spermatozoon of this species has a primitive type and is similar tothose of Ostreidae. Ultrastructures of mature sperms are composed of broad, modified cap-shaped acrosomal vesicle and anaxial rod in subacrosomal materials on an oval nucleus, four spherical mitochondria in the sperm midpiece, and satellite fibreswhich appear near the distal centriole. The axoneme of the sperm tail shows a 9+2 structure. Accordingly, the ultrastructuralcharacteristics of mature sperm of C. ariakensis resemble to those of other investigated ostreids in Ostreidae in the subclassPteriomorphia. In this study, particularly, two transverse bands (stripes) appear at the anterior region of the acrosomal vesicleof this species, unlike two or three transverse bands (stripes) in C. gigas. It is assumed that differences in this acrosomalsubstructure are associated with the inability of fertilization between the genus Crassostrea and other genus species inOstreidae. Therefore, we can use sperm ultrastructures and morphologies in the resolution of taxonomic relationships withinthe Ostreidae in the subclass Pteriomorphia. These spermatozoa, which contain several ultrastructures such as acrosomalvesicle, an axial rod in the sperm head part and four mitochondria and satellite fibres in the sperm midpiece, belong to thefamily Ostreidae in the subclass Pteriomorphia.
Abstract
Characteristics of the developmental stages of spermatids during spermiogenesis and phylogeneticclassicfication of the species using sperm ultrastructures in male Crassostrea ariakensis were investigated by transmissionelectron microscope observations. The morphology of the spermatozoon of this species has a primitive type and is similar tothose of Ostreidae. Ultrastructures of mature sperms are composed of broad, modified cap-shaped acrosomal vesicle and anaxial rod in subacrosomal materials on an oval nucleus, four spherical mitochondria in the sperm midpiece, and satellite fibreswhich appear near the distal centriole. The axoneme of the sperm tail shows a 9+2 structure. Accordingly, the ultrastructuralcharacteristics of mature sperm of C. ariakensis resemble to those of other investigated ostreids in Ostreidae in the subclassPteriomorphia. In this study, particularly, two transverse bands (stripes) appear at the anterior region of the acrosomal vesicleof this species, unlike two or three transverse bands (stripes) in C. gigas. It is assumed that differences in this acrosomalsubstructure are associated with the inability of fertilization between the genus Crassostrea and other genus species inOstreidae. Therefore, we can use sperm ultrastructures and morphologies in the resolution of taxonomic relationships withinthe Ostreidae in the subclass Pteriomorphia. These spermatozoa, which contain several ultrastructures such as acrosomalvesicle, an axial rod in the sperm head part and four mitochondria and satellite fibres in the sperm midpiece, belong to thefamily Ostreidae in the subclass Pteriomorphia.
참고문헌 (22)
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