Ultrastructural aspects of spermatogonesis in Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955 (Monogenea; Microcotylidae)

Memórias do Instituto Oswaldo Cruz

Maria De Fatima Diniz Baptista Farias²  Anna Kohn²  Ortrud Monika Barth¹ 

[1] ,Instituto Oswaldo Cruz Departamento de Helmintologia Laboratório de Helmintos Parasitos de PeixesRio de Janeiro,Brasil

关键词: ultrastructure;    Metamicrocotyla macracantha;    Monogenea;    spermatogenesis;    spermiogenesis;    spermatozoa;   

DOI  :  10.1590/S0074-02761995000500010

来源: SciELO

【 摘 要 】

Ultrastructural aspects of spermatogenesis, spermiogenesis and of the mature spermatozoon 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.

【 授权许可】

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