Morphology of the male genital organs in amazonian tucuxi (Sotalia fluviatilis) / Morfologia dos órgãos genitais masculinos do tucuxi amazônico (Sotalia fluviatilis)

AUTOR(ES)

Simone Machado Pereira

DATA DE PUBLICAÇÃO

2008

RESUMO

Sotalia fluviatilis is endemic in Amazon region and the only Delphinidae living in freshwater. It is considered by IUCN as an insufficiently known specie (deficient data) and is included in CITES Appendices I as a threatened specie. Additionally, this species is currently hunted and used as bait for fishing practices of a catfish called piracatinga. Thus, all efforts directed toward understanding the biology of this animal are important and may help to implement future conservation strategies. In the present study, samples of males tucuxis genital organs provided by Instituto de Desenvolvimento Sustentável Mamirauá and Instituto de Pesquisas da Amazônia were analyzed by gross and microscopic techniques and by scanning electron microscopy. The male tucuxis genital organs are represented by big testes and a typical epididymis that is adhered to the abdominal cavity wall by the mesorchium. The ductus deferens are convoluted in the proximal region and straight in the distal portion, and a small uterus masculinus is located between them. The prostata is small, compact, covered by the prostate compressor muscle, and totally involves the pelvic urethra. The penis is fibroelastic and characterized by a spiral sigmoid flexure that ends in a tapering cone. The crura are inserted on small pelvic bones, and the ischiocavernosus, bulbospongiosus and retractor penis muscles are associated to the base of the penis. In general, the structure, location and function of these organs are similar to other Cetacea species, except about some details.

ASSUNTO(S)

histologia animal microscopia eletrônica de varredura scanning electron microscopy Órgãos genitais do macho animal animal gross anatomy animal male genital organs animal morphology morfologia animal anatomia animal animal histology

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