Spermatogenesis and Taxonomic Value of Sperm Ultrastructure in Coecella chinensis (Mesodesmatidae), and Sperm Ultrastructural Differences between Mesodesmatidae and Mactridae (Bivalvia, Heterodonta)

Kim, Jin Hee; Lee, Ki-Young

doi:10.13000/jfmse.2019.12.31.6.1649

Cited by 1 publication

(2 citation statements)

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“…One more interesting observation that is worth to be discussed is the unusual orientation of axoneme in spermatogenic cells of C. pacifica during spermatogenesis. As it was reported for various species of bivalves, spermatocytes and spermatids typically have their flagella externally/posteriorly oriented (Erkan & Sousa, 2002;Healy, Mikkelsen, & Bieler, 2015;Kim, Kim, Yoo, & Yang, 2005;Kim & Lee, 2019). However, the axoneme located in proximity to the nucleus in early spermatogenic cells was also described from a few molluscan species (Chen, Rao, Ke, & Xu, 2006;Erkan & Sousa, 2002;Nicotra & Zappata, 1991;Reunov et al, 1999;.…”

Section: Spermatozoamentioning

confidence: 84%

“…The varying number of mitochondria is a frequently occurring phenomenon in bivalves (e.g., Gladyshev & Drozdov, 2002;Healy, 1996;Introíni et al, 2013;Keys & Healy, 1999) and in Venerida species (supplementary online material, Table S1). Four or five mitochondria were found in Coecella chinensis (Kim & Lee, 2019), Pitar rudis (Erkan & Sousa, 2002), Paphia philippiana (as P. exarata) (Chen et al, 2006), Arctica islandica, and N. sublaevigatum (Healy et al, 2020). However, there is always a predominant number of mitochondria.…”

Section: Midpiecementioning

confidence: 99%

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Ultrastructural aspects of spermatogenesis in Calyptogena pacifica Dall 1891 (Vesicomyidae; Bivalvia)

Yurchenko

Борзых

Kalachev

2020

Journal of Morphology

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The process of spermatogenesis and spermatozoon morphology was characterized from a deep-sea bivalve, Calyptogena pacifica (Vesicomyidae, Pliocardiinae), a member of the superfamily Glossoidea, using light and electron microscopy. Spermatogenesis in C. pacifica is generally similar to that in shallow-water bivalves but, the development of spermatogenic cells in this species has also some distinguishing features. First proacrosomal vesicles are observed in early spermatocytes I. Although, early appearance of proacrosomal vesicles is well known for bivalves, in C. pacifica, these vesicles are associated with electron-dense material, which is located outside the limiting membrane of the proacrosomal vesicles and disappears in late spermatids. Another feature of spermatogenesis in C. pacifica is the localization of the axoneme and flagellum development. Early spermatogenic cells lack typical flagellum, while in spermatogonia, spermatocytes, and early spermatids, the axoneme is observed in the cytoplasm. In late spermatids, the axoneme is located along the nucleus, and the flagellum is oriented anteriorly. During sperm maturation, the bent flagellum is transformed into the typical posteriorly oriented tail. Spermatozoa of C. pacifica are of ect-aqua sperm type with a bullet-like head of about 5.8 μm in length and 1.8 μm in width, consisting of a well-developed dome-shaped acrosomal complex, an elongated barrel-shaped nucleus filled with granular chromatin, and a midpiece with mainly four rounded mitochondria. A comparative analysis has shown a number of common traits in C. pacifica and Neotrapezium sublaevigatum.

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