Ultrastructural aspects of spermatogonesis in Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955 (Monogenea; Microcotylidae)
Mem. Inst. Oswaldo Cruz
;
90(5): 597-604, set.-oct. 1995. ilus
Artículo
en Inglés
| LILACS
| ID: lil-157274
ABSTRACT
Ultrastructural aspects of spermatogenesis, spermiogenesis and of the mature spermatozzon of a microcotylid monogenean Metamicrocotyla macracantha parasite from Mugil liza, are described. The irregularly-shaped spermatogonia divides by successive mitoses, forming the primary spermatocytes, identified by the presence of synaptonemal complexes in their nuclei. The spermatids formed by meiotic cell divisions of the secondary spermatocytes, differentiate into a mature spermatozoon. Cross sections of the head and the middle region of mature spermatozoa show the nucleus with strong condensed chromatin, the mitochondria with short cristae, peripheral microtubules and two axonemes with a 9+1 pattern, confirming the characteristics of this genus.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Espermatogénesis
/
Espermatozoides
/
Trematodos
/
Peces
Tipo de estudio:
Estudio pronóstico
Límite:
Animales
Idioma:
Inglés
Revista:
Mem. Inst. Oswaldo Cruz
Asunto de la revista:
Medicina Tropical
/
Parasitología
Año:
1995
Tipo del documento:
Artículo
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