Gonad morphology and type of sexuality in Parastacus defossus Faxon 1898, a burrowing, intersexed crayfish from southern Brazil (Decapoda: Parastacidae)

The aim of this study was to characterize the morphology of the reproductive system and the type of sexuality of Parastacus defossus, an intersexed, freshwater crayfish that occurs in the southeast of Brazil and Uruguay. The specimens were examined for the appearance of the genital pores, and the go...

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Autor principal:	López G., Laura Susana
Publicado:	2008
Materias:	Gonad morphology Hermaphroditism Intersexuality Parastacidae crayfish histology morphology sexuality type specimen Brazil South America Uruguay Astacoidea Parastacus defossus
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00017272_v89_n1_p59_Noro http://hdl.handle.net/20.500.12110/paper_00017272_v89_n1_p59_Noro
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00017272_v89_n1_p59_Noro
record_format	dspace
spelling	paper:paper_00017272_v89_n1_p59_Noro2023-06-08T14:21:22Z Gonad morphology and type of sexuality in Parastacus defossus Faxon 1898, a burrowing, intersexed crayfish from southern Brazil (Decapoda: Parastacidae) López G., Laura Susana Gonad morphology Hermaphroditism Intersexuality Parastacidae crayfish histology morphology sexuality type specimen Brazil South America Uruguay Astacoidea Parastacidae Parastacus defossus The aim of this study was to characterize the morphology of the reproductive system and the type of sexuality of Parastacus defossus, an intersexed, freshwater crayfish that occurs in the southeast of Brazil and Uruguay. The specimens were examined for the appearance of the genital pores, and the gonads were macroscopically analysed by size and colour. The histology of some gonads was examined. Males and females have two pairs of genital ducts: one anterior (oviduct) and one posterior (vas deferens). The gonads are located in the thorax and consist of one pair of lobules. Through macroscopic and histological analyses of the female gonads, six stages of ovarian development could be distinguished. The histological description of the testis was made only from adult males. Through analyses of the genital pores and gonads, three sexual forms were distinguished in P. defossus: intersexed females (246), intersexed males (259), and individuals with an ootestis (7). Individuals with an ootestis had a gonad that produced male and female reproductive cells simultaneously. Parastacus defossus can be classified as a partially protandric hermaphrodite species. © 2007 The Authors. Fil:López-Greco, L.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00017272_v89_n1_p59_Noro http://hdl.handle.net/20.500.12110/paper_00017272_v89_n1_p59_Noro
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Gonad morphology Hermaphroditism Intersexuality Parastacidae crayfish histology morphology sexuality type specimen Brazil South America Uruguay Astacoidea Parastacidae Parastacus defossus
spellingShingle	Gonad morphology Hermaphroditism Intersexuality Parastacidae crayfish histology morphology sexuality type specimen Brazil South America Uruguay Astacoidea Parastacidae Parastacus defossus López G., Laura Susana Gonad morphology and type of sexuality in Parastacus defossus Faxon 1898, a burrowing, intersexed crayfish from southern Brazil (Decapoda: Parastacidae)
topic_facet	Gonad morphology Hermaphroditism Intersexuality Parastacidae crayfish histology morphology sexuality type specimen Brazil South America Uruguay Astacoidea Parastacidae Parastacus defossus
description	The aim of this study was to characterize the morphology of the reproductive system and the type of sexuality of Parastacus defossus, an intersexed, freshwater crayfish that occurs in the southeast of Brazil and Uruguay. The specimens were examined for the appearance of the genital pores, and the gonads were macroscopically analysed by size and colour. The histology of some gonads was examined. Males and females have two pairs of genital ducts: one anterior (oviduct) and one posterior (vas deferens). The gonads are located in the thorax and consist of one pair of lobules. Through macroscopic and histological analyses of the female gonads, six stages of ovarian development could be distinguished. The histological description of the testis was made only from adult males. Through analyses of the genital pores and gonads, three sexual forms were distinguished in P. defossus: intersexed females (246), intersexed males (259), and individuals with an ootestis (7). Individuals with an ootestis had a gonad that produced male and female reproductive cells simultaneously. Parastacus defossus can be classified as a partially protandric hermaphrodite species. © 2007 The Authors.
author	López G., Laura Susana
author_facet	López G., Laura Susana
author_sort	López G., Laura Susana
title	Gonad morphology and type of sexuality in Parastacus defossus Faxon 1898, a burrowing, intersexed crayfish from southern Brazil (Decapoda: Parastacidae)
title_short	Gonad morphology and type of sexuality in Parastacus defossus Faxon 1898, a burrowing, intersexed crayfish from southern Brazil (Decapoda: Parastacidae)
title_full	Gonad morphology and type of sexuality in Parastacus defossus Faxon 1898, a burrowing, intersexed crayfish from southern Brazil (Decapoda: Parastacidae)
title_fullStr	Gonad morphology and type of sexuality in Parastacus defossus Faxon 1898, a burrowing, intersexed crayfish from southern Brazil (Decapoda: Parastacidae)
title_full_unstemmed	Gonad morphology and type of sexuality in Parastacus defossus Faxon 1898, a burrowing, intersexed crayfish from southern Brazil (Decapoda: Parastacidae)
title_sort	gonad morphology and type of sexuality in parastacus defossus faxon 1898, a burrowing, intersexed crayfish from southern brazil (decapoda: parastacidae)
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00017272_v89_n1_p59_Noro http://hdl.handle.net/20.500.12110/paper_00017272_v89_n1_p59_Noro
work_keys_str_mv	AT lopezglaurasusana gonadmorphologyandtypeofsexualityinparastacusdefossusfaxon1898aburrowingintersexedcrayfishfromsouthernbrazildecapodaparastacidae
_version_	1768546653905616896

Gonad morphology and type of sexuality in Parastacus defossus Faxon 1898, a burrowing, intersexed crayfish from southern Brazil (Decapoda: Parastacidae)

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