INSIBIO   05451
INSTITUTO SUPERIOR DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Histomorphology of testis in the gastropod Pomacea bridgesii.
Autor/es:
VALDEZ I; PUCCI ALCAIDE A; WINIK BC; CATALÁN M
Lugar:
Mendoza
Reunión:
Congreso; XXIV Annual Scientific Meeting Tucumán Biology Association; 2008
Institución organizadora:
Sociedades de Biología de la República Argentina
Resumen:
HISTOMORPHOLOGY OF TESTIS IN THE GASTROPOD
Pomacea bridgessii
Valdez I, Pucci Alcaide A, Winik B, Catalán M.
Fac. Ciencias. Naturales. UNT. E-mail: catalan@csnat.unt.edu.ar
P. bridgessii is a diecious oviparous South American amphibian
gastropod. The aim of this work is to study the microscopic structure
of P. bridgessii testis, processing the samples with routine histological
technicque. The testis, covered by a cubic ephithelial
monolayer, presents numerous seminiferous tubules formed by
Sertoli and germinals. cells The former are irregular in shape and
present a voluminous nucleus with one or two nucleoli and a slightly
acidophilous cytoplasm. The germinal cells generate simultaneously
three types of sperm. Eusperm have an elongated head, helicoidally
folded, and a long tail. The apyrene paraesperm have no nuclei and
present a fusiform body and a caudal tuft of flagella. The oligopyrene
parasperm present a pyriform head with residual chromatine
and a long tail with a robust middle piece. Conclusions: The spermatic
polymorphism of P. bridgessii implies the occurrence of different
spermatogenic mechanisms. Eusperm have the typical morphology
of introsperm. As in P. canaliculata, P. bridgessii presents
two types of parasperm, although apyrene parasperm have a greater
number of flagella.