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Ultrastructural study of spermiogenesis in far-eastern redfins of the genus Tribolodon (Pisces: Cyprinidae)
At the spermatid stage, ultrastructural analysis of male germ cells showed no obvious differences between these species, and the spermatozoa are primitive acrosome-lacking cells, which are typically found in many representatives of Teleostei with external insemination. Expand
Spermatozoa ultrastructure of two basal pilidiophoran nemerteans, Hubrechtella juliae and Sonnenemertes cantelli (Nemertea, Pilidiophora).
The results suggest that spermatozoa provide a useful source of characters for nemertean systematics, and a pattern of the acrosomal complex organization is described for Nemertea for the first time. Expand
Ultrastructural Study of Relationships between Germinal Bodies and Mitochondria in Apostichopus japonicus (Echinodermata: Holothuroidea) and Pleuronectes asper (Teleostei: Pleuronectidae)
It is supposed that the substance of the mitochondrial matrix takes part in the development and functioning of the germinal plasm in both invertebrates and vertebrates. Expand
The relationships of Stichaeus nozawae (Jordan et Snyder, 1902) and Stichaeus grigorievi (Herzenstein, 1890) (Pisces: Stichaeidae) inferred from the data of genetic and karyological analyses and
The lack of variations in DNA and the chromosome set that are suitable for species differentiation, between Nozawa's and Grigorev’s pricklebacks is an evidence for the evolutionary adolescence of these species. Expand
Postspawning Destruction of Male Gametes in Polycyclic and Monocyclic Bony Fishes: Pointhead Flounder, Cleisthenes herzensteini Schmidt (Pleuronectidae) and Chum Salmon, Oncorhynchus keta Walbaum
The process of the destruction of nonreleased spermatozoa was studied using TEM in the postspawning gonads of the chum salmon Oncorhynchus keta and the pointhead flounder Cleisthenes herzensteini, asExpand
Comparative analysis of gamete ultrastructure in big-scaled redfin Tribolodon hakonensis (Cyprinidae) from Southern Primorye and Sakhalin
Observed differences confirm the specificity of gametes in the southern and northern forms of T. hakonensis, and they can be used as additional phylogenetic traits. Expand
Comparative studies of follicle cells in testes of Glyptocephalus stelleri and Pleuronectes pinnifasciatus (teleostei, pleuronectidae)
Accessory cells were studied in early spermatogenesis of flatfishes Glyptocephalus stelleri and Pleuronectes pinnifasciatus using transmission electron microscopy and found that these cells had morphological organization, which had not been previously described. Expand
Ultrastructural study of spermatogenesis in silver salmon Oncorhynchus kisutch and cherry salmon O. masou (Salmonidae, Teleostei)
At the final stage of spermiogenesis, the disappearance of an AS allows one to considering it to be a temporarily existing structure that recapitulates the ancestral morphotype of salmonid sperm. Expand
Gamet Ultrastructure in Some Species of the Genus Icelus (Pisces: Cottidae)
The morphology of spermatozoa of Icelus spiniger and egg envelopes of I.spiniger and I. spatula has been studied and the axoneme has a structure described by the formula 9 + 2. Expand