Angel-Dapa, M.A., M., Arellano-Martínez, E., Uría-Galicia, E.O., López-Villegas, B.P., Ceballos Vázquez & P., Saucedo (2024). Ultrastructure of spermatogenesis in lion’s paw scallop Nodipecten subnodosus (Sowerby, 1835), with some implications in the systematics of the Pectinidae. AquaTechnica. 6(2): 109-120. DOI: 10.33936/at.v6i2.6893.
Marco Antonio Angel-Dapa 1, Marcial Arellano-Martínez 1, Ether Uría-Galicia 2, Edgar O. López-Villegas 2, Bertha Patricia Ceballos Vázquez 1 y Pedro Saucedo 3
This is the first study to characterize the ultrastructure of spermatogenesis in the lion’s paw scallop Nodipecten subnodosus, discussing some implications of cell morphology and function in the systematics of the family Pectinidae. Gonad samples were collected on a monthly basis during an annual cycle and processed using conventional TEM techniques. The number and area of developing cells occurring throughout spermatocytogenesis, meiosis, and spermiogenesis were determined. Overall, the arrangement of developing cells was concentric and most cellular changes comprising the transition from spermatogonia to spermatid matched the general pattern of marine bivalves undergoing external fertilization. The main features included a primitive-type, tailed sperm with four spherical mitochondria located in the midpiece, and the typical 9+2 arrangement of microtubules surrounding the centriole. During spermatogenesis, the key changes in cell morphology occurred up to the spermatozoon stage, including the appearance of a bullet-shaped nucleus, a conical acrosome, a small oval-shaped proacrosomal vesicle, and two lateral satellite fibers linked to the centriole. The flagellum also formed up to the sperm stage. Taxonomically, these features appear to be family-specific or species-specific and suggest that N. subodosus may be closely related to the hermaphrodite scallops Patinopecten yessoensis, Chlamys farreri farreri, C. swiftii, and Argopecten irradians within the family Pectinidae.
Palabras clave: Scallops; Reproduction; spermatogenesis taxonomy
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