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
Artigo
em Inglês
| 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:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Espermatogênese
/
Espermatozoides
/
Trematódeos
/
Peixes
Tipo de estudo:
Estudo prognóstico
Limite:
Animais
Idioma:
Inglês
Revista:
Mem. Inst. Oswaldo Cruz
Assunto da revista:
Medicina Tropical
/
Parasitologia
Ano de publicação:
1995
Tipo de documento:
Artigo
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