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
Article
Dans Anglais
| 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.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Spermatogenèse
/
Spermatozoïdes
/
Trematoda
/
Poissons
Type d'étude:
Étude pronostique
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Mem. Inst. Oswaldo Cruz
Thème du journal:
Médecine tropicale
/
Parasitologie
Année:
1995
Type:
Article
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