Data/hora: 02/06/2024 16:49:57

Provedor de dados: | International Journal of Morphology
País: | Chile
Título: | Ultrastructural Study of Spermatogenesis in Eisenia foetida (Annelida, Oligochaeta)
Autores: | Rolando,A.; Romanini,M. C.; Mugnaini,M. T.; Bozzo,A.; Pastorino,I.; Soñez,C. A.
Data: | 2007-06-01
Ano: | 2007
Palavras-chave: | Oligochaeta; Spermatogenesis; Ultrastructure; Spermatozoa; Eisenia.
Resumo: | Spermatogenesis and the spermatozoon ultrastructure follow a common pattern in terrestrial oligochaetes. However, many of their characteristics are distinctive of each species and they are of great importance for phylogenetic and taxonomic studies. Germinal cells were studied through conventional electronic microscope techniques in order to go deep on spermatogenesis, especially on the mature spermatozoon ultrastructure of Eisenia foetida. Spermatogenesis occurs in seminal vesicles and follows a pattern comparable to that of some other oligachaetes species. Spermatozoon ultrastructural details revealed that it is a filiform cell, with the acrosome placed in anterior position, followed by the nucleus, the midpiece and the tail which flagellum has a 9+2 typical microtubular configuration. We may conclude that Eisenia foetida spermatozoon is of a apomorphic type since it presents several evolved characteristics such as: a very large acrosome; the primary acrosomic vesicle is held within the acrosomal tube, the axial rod is very elongated and ended in a developed capitulum and a number of mitochondria of the midpiece equal to six
Tipo: | Journal article
Idioma: | Inglês
Identificador: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200005
Editor: | Sociedad Chilena de Anatomía
Formato: | text/html
Fonte: | International Journal of Morphology  v.25 n.2 2007