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Resumen del producto
Villalejo Fuerte, M.T., M.A., Camacho-Mondragón, B.P., Ceballos-Vázquez, E.O., López-Villegas, E., Uría-Galicia & M., Arellano-Martínez
(2018).
Ultrastructure of sperm development and mature sperm morphology in Spondylus calcifer and S. Princeps (Bivalvia: spondylidae).
Malacologia.
62(1): 1-11.
DOI: 10.4002/040.062.0102.
Ultrastructure of sperm development and mature sperm morphology in Spondylus calcifer and S. Princeps (Bivalvia: spondylidae)
Marcial Trinidad Villalejo Fuerte, Marian Alejandra Camacho-Mondragón, Bertha Patricia Ceballos-Vázquez, Edgar Oliver López-Villegas, Esther Uría-Galicia y Marcial Arellano-Martínez
The entire spermatogenesis process and the presence of accessory cells in sperm developmentin Spondylus princeps Broderip, 1833, and S. calcifer Carpenter, 1857, were describedfor the first time. Spermatogenesis in both species showed similar anatomical and ultrastructuralfeatures. The testis contained amoeboid somatic cells inside the acini, frequentlyassociated with developing gametes. Overall, spermatogenesis followed the typical patternreported for other bivalve species, except for a few specific details. In S. princeps, intercellularbridges between spermatogonia, as well as one spermatocyte with seven mitochondria wereobserved. Both species had mature sperm of the ect-aquasperm type, consisting of a head,which contains a spherical-pyriform nucleus and a conical acrosome bounded by two regionsof different density, four spherical mitochondria and two centrioles in the middle piece; theflagellum showed a standard 9 + 2 microtubule arrangement.
Palabras clave: accessory cells; intercellular bridges; ect-aquasperm; Gulf of California
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