TY - JOUR
T1 - Ultrastructure of Sperm Development and Mature Sperm Morphology in Spondylus calcifer and S. Princeps (Bivalvia: Spondylidae)
AU - Villalejo-Fuerte, Marcial
AU - Camacho-Mondragón, Marian Alejandra
AU - Ceballos-Vázquez, Bertha Patricia
AU - López-Villegas, Edgar Oliver
AU - Uría-Galicia, Esther
AU - Arellano-Martínez, Marcial
N1 - Publisher Copyright:
© 2018 Institute of Malacology. All rights reserved.
PY - 2018/3
Y1 - 2018/3
N2 - The entire spermatogenesis process and the presence of accessory cells in sperm development in Spondylus princeps Broderip, 1833, and S. calcifer Carpenter, 1857, were described for the first time. Spermatogenesis in both species showed similar anatomical and ultrastructural features. The testis contained amoeboid somatic cells inside the acini, frequently associated with developing gametes. Overall, spermatogenesis followed the typical pattern reported for other bivalve species, except for a few specific details. In S. princeps, intercellular bridges between spermatogonia, as well as one spermatocyte with seven mitochondria were observed. 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 regions of different density, four spherical mitochondria and two centrioles in the middle piece; the flagellum showed a standard 9 + 2 microtubule arrangement.
AB - The entire spermatogenesis process and the presence of accessory cells in sperm development in Spondylus princeps Broderip, 1833, and S. calcifer Carpenter, 1857, were described for the first time. Spermatogenesis in both species showed similar anatomical and ultrastructural features. The testis contained amoeboid somatic cells inside the acini, frequently associated with developing gametes. Overall, spermatogenesis followed the typical pattern reported for other bivalve species, except for a few specific details. In S. princeps, intercellular bridges between spermatogonia, as well as one spermatocyte with seven mitochondria were observed. 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 regions of different density, four spherical mitochondria and two centrioles in the middle piece; the flagellum showed a standard 9 + 2 microtubule arrangement.
KW - Gulf of California
KW - accessory cells
KW - ect-aquasperm
KW - intercellular bridges
UR - http://www.scopus.com/inward/record.url?scp=85048435487&partnerID=8YFLogxK
U2 - 10.4002/040.062.0102
DO - 10.4002/040.062.0102
M3 - Artículo
AN - SCOPUS:85048435487
SN - 0076-2997
VL - 62
SP - 1
EP - 10
JO - Malacologia
JF - Malacologia
IS - 1
ER -