TY - JOUR
T1 - Ultrastructure of the spermatogenic process in the Penshell Atrina maura (Bivalvia: Pinnidae)
AU - Camacho-Mondragón, Marian Alejandra
AU - Ceballos-Vázquez, Bertha Patricia
AU - Galicia, Esther Uriá
AU - Villegas, Edgar Oliver López
AU - Arellano-Martínez, Marcial
PY - 2014/11/1
Y1 - 2014/11/1
N2 - The ultrastructural features of the spermatogenic development and mature spermatozoa morphology of Atrina maura were investigated through transmission electron microscopy. The testis displays a diffuse tubular structure in which gametes develop within a concentric arrangement according to the degree of development. Within the tubules also appear Sertoli cells, which contain a large amount of lipid droplets and glycogen granules in the cytoplasm, suggesting a nutritive role in the first spermatogenesis stage (spermatogonia). Four gamete maturation stages co-occurred in the same individual: spermatogonia (4-8 m), spermatocytes (3-4 m) (including primary and secondary), spermatids (2.5 m) and spermatozoa (∼ 2 m head length). The proacrosomal vesicle and flagellum occur only until the first stages of spermiogenesis, contrasting with the early formation of both structures in spermatogonia and spermatocytes in other bivalves. In A. maura, the material in the acrosomal vesicle of mature spermatozoa shows a characteristic electron density pattern, which seems to be an exclusive taxonomic feature of the family Pinnidae. However, A. maura displayed only four mitochondria in the midpiece, contrasting with five in all other species in this family.
AB - The ultrastructural features of the spermatogenic development and mature spermatozoa morphology of Atrina maura were investigated through transmission electron microscopy. The testis displays a diffuse tubular structure in which gametes develop within a concentric arrangement according to the degree of development. Within the tubules also appear Sertoli cells, which contain a large amount of lipid droplets and glycogen granules in the cytoplasm, suggesting a nutritive role in the first spermatogenesis stage (spermatogonia). Four gamete maturation stages co-occurred in the same individual: spermatogonia (4-8 m), spermatocytes (3-4 m) (including primary and secondary), spermatids (2.5 m) and spermatozoa (∼ 2 m head length). The proacrosomal vesicle and flagellum occur only until the first stages of spermiogenesis, contrasting with the early formation of both structures in spermatogonia and spermatocytes in other bivalves. In A. maura, the material in the acrosomal vesicle of mature spermatozoa shows a characteristic electron density pattern, which seems to be an exclusive taxonomic feature of the family Pinnidae. However, A. maura displayed only four mitochondria in the midpiece, contrasting with five in all other species in this family.
KW - Pteriomorphia
KW - Sertoli cells
KW - acrosomal complex
KW - spermatic ultrastructure
KW - taxonomic implications
UR - http://www.scopus.com/inward/record.url?scp=84926350097&partnerID=8YFLogxK
U2 - 10.4002/040.057.0206
DO - 10.4002/040.057.0206
M3 - Artículo
AN - SCOPUS:84926350097
SN - 0076-2997
VL - 57
SP - 329
EP - 339
JO - Malacologia
JF - Malacologia
IS - 2
ER -