Differentiation of the sexual characters and onset of maturity in the males of the "red claw" crayfish, Cherax quadricarinatus (Von Martens, 1898) (Astacidea, Astacida, Parastacidae)

dc.creatorVazquez, Fernanda Jimena
dc.creatorLopez, Laura Susana
dc.date2010-06
dc.identifierhttp://hdl.handle.net/11336/69926
dc.identifierVazquez, Fernanda Jimena; Lopez, Laura Susana; Differentiation of the sexual characters and onset of maturity in the males of the "red claw" crayfish, Cherax quadricarinatus (Von Martens, 1898) (Astacidea, Astacida, Parastacidae); Brill Academic Publishers; Animal Biology; 60; 2; 6-2010; 195-208
dc.identifier1570-7555
dc.identifierCONICET Digital
dc.identifierCONICET
dc.descriptionThe differentiation of the male reproductive system, the copulatory structures, "red patch" and onset of sexual maturity were studied in Cherax quadricarinatus. For this characterization 353 males were observed, dissected and processed for histological analysis. Three developmental stages were identified. At stage I the testes are two parallel cords with a few lobes or acinii, connected medially by a short thin bridge (X-shape) and the vasa deferentia are straight transparent cords. In the second stage, more lobulated testes present an H-shape and the vas deferens begins to differentiate into three distinct regions: proximal, medial and distal. In the last stage testes are two parallel cords tending to fuse along their entire length and become a single structure. From this stage, the development of the "red patch" occurs and spermatophore formation is observed in the vas deferens giving it white colour. These primary and secondary sexual characters could indicate the onset of sexual maturity. The morphology of the copulatory structure is lobular at stage I and it differentiates into an elongated structure during stage II. This study shows that in C. quadricarinatus the differentiation of primary and secondary sexual characters of males starts simultaneously and very early in development (0.09-0.10g achieved nearly 1 month old) and that acquisition of sexual maturity is also an early event (6g achieved nearly 3 month old). The compared features within Astacidea and Decapoda and the possible applications in the analysis of phylogenetic relationships between different taxa are discussed.
dc.descriptionFil: Vazquez, Fernanda Jimena. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental. Laboratorio de Biología de la Reproducción y Crecimiento de Crustáceos Decápodos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina
dc.descriptionFil: Lopez, Laura Susana. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental. Laboratorio de Biología de la Reproducción y Crecimiento de Crustáceos Decápodos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.formatapplication/pdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherBrill Academic Publishers
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/10.1163/157075610X491734
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://brill.com/abstract/journals/ab/60/2/article-p195_8.xml
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subjectCrayfish
dc.subjectMales
dc.subjectMorphology
dc.subjectSexual Differentiation
dc.subjectSexual Maturity
dc.subjecthttps://purl.org/becyt/ford/1.6
dc.subjecthttps://purl.org/becyt/ford/1
dc.titleDifferentiation of the sexual characters and onset of maturity in the males of the "red claw" crayfish, Cherax quadricarinatus (Von Martens, 1898) (Astacidea, Astacida, Parastacidae)
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/publishedVersion


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