Sexual system of the freshwater shrimps of the genus Potimirim Holthuis (Decapoda : Caridea : Atyidae): is there a pattern in this genus?

Autor(es)

Grilli, Natalia de Miranda ^[1] ; Terossi, Mariana ^[1] ; Mantelatto, Fernando L. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Lab Bioecol & Systemat Crustaceans, Dept Biol, Fac Philosophy Sci & Letters Ribeirao Preto FFCLR, BR-05508 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MARINE AND FRESHWATER RESEARCH; v. 65, n. 9, p. 759-765, 2014.
• Citações Web of Science: 0

Resumo

Among the genus Potimirim, the sexual system has been studied only in Potimirim mexicana, which was suggested as being a sequential protandric shrimp. The genus Potimirim comprises five described species that occur in drainages along the western Atlantic coast. We tested the hypothesis that there is a common shared sexual system pattern for the genus Potimirim, and that both species reported for Brazil (P. brasiliana and P. potimirim) are sequentially protandric. The animals were analysed with respect to sex, external morphology and nature of the gonads. We found similar results for both species: females were significantly larger than males; the appendix masculina increased significantly as the carapace enlarged; all adult males had cincinnuli and only well-developed testes; all females lacked cincinnuli and had only well-developed ovaries; and all males and females had a non-prehensile third pereopod. The absence of any characteristic that could be interpreted as evidence of sex change indicates that these species are gonochoric species. Therefore we concluded that there is no sexual system shared by all members of this genus. Additionally, we compared our results with a molecular phylogeny previously proposed for the genus Potimirim, as the baseline to discuss the sexual system in this genus. (AU)

• Processo FAPESP: 09/54931-0 - Melhoria e capacitação das coleções científicas do Departamento de Biologia da Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo
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• Modalidade de apoio: Auxílio à Pesquisa - Programa Infraestrutura - Acervos biológicos
• Processo FAPESP: 02/08178-9 - Espécies do gênero Portunus do Pacífico oeste e sua relação com as espécies do grupo Atlântico americano: um estudo sobre filogenia molecular, taxonomia e evolução
• Beneficiário: Fernando Luis Medina Mantelatto
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• Processo FAPESP: 10/50188-8 - Crustáceos decápodes: multidisciplinaridade na caracterização da biodiversidade marinha do estado de São Paulo (taxonomia, espermiotaxonomia, biologia molecular e dinâmica populacional) (Biodiversidade Marinha)
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• Processo FAPESP: 11/11901-3 - Sistemática filogenética dos camarões do gênero Hippolyte (Decapoda: Caridea: Hippolytidae)
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