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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 90, No. 5, 1995, pp. 597-604
Bioline Code: oc95120
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 90, No. 5, 1995, pp. 597-604

 en Ultrastructural aspects of spermatogenesis in Metamicrocotyla macracantha (alexander,1954) koratha,1955 (monogenea; microcotylidae)
Maria de Fatima Diniz Baptista Farias; Anna Kohn & Ortrud Monika Barth

Abstract

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.

Keywords
ultrastructure - Metamicrocotyla macracantha - Monogenea - spermatogenesis - spermiogenesis - spermatozoa

 
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