Spermiogenesis and spermatozoa in the relict bivalve genus Neotrigonia: relevance to trigonioid relationships, particularly Unionoidea
作者： J. M. Healy
DOI: 10.1007/BF00391066
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摘要: Spermiogenesis and spermatozoa in the relict trigonioid genus Neotrigonia are examined ultrastructurally. Mature spp. exhibit following features: (1) a blunt-conical nucleus; (2) an acrosomal complex composed of discoidal vesicles (9 to 15) arranged as thin layer over nuclear apex; (3) five (rarely four) spherical mitochondria positioned depressions at base (4) proximal distal centrioles (surrounded by mitochondria); (5) satellite anchoring centriole flagellum plasma membrane; (6) single flagellum. Spermatozoa unionoids date (Unionidae Hyriidae only) similar features, including nucleus with blunt apex capped (showing up three vesicles). Among Bivalvia, only unionoid sperm possess multiple vesicles. These data suggest that Trigonioidea Unionoidea phylogenetically linked, but further work particularly on primitive is required determine if this relationship one common ancestry or whether have fact been derived from Trigonioidea.
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