Estudo da fauna de Anacroneuria (Plecoptera: Perlidae) na Bacia Hidrográfica do Rio dos Sinos, Estado do Rio Grande do Sul, com dados sobre a fecundidade de Anacroneuria trimacula / Study of the fauna of Anacroneuria (Plecoptera: Perlidae) from the Rio dos Sinos basin, and data on the fecundity of Anacroneuria trimacula

AUTOR(ES)

Valdelânia Ribeiro de Ribeiro

DATA DE PUBLICAÇÃO

2006

RESUMO

Stoneflies are ancient and relatively primitive insects. Plecopterans number about 2000 species belonging to 16 families. In Brazil two families are known, Gripopterygidae and Perlidae. Two genera of Perlidae have been reported from Rio Grande do Sul State, Anacroneuria and Kempnyia. The intention of this work was to inventory the Anacroneuria fauna in the Sinos River catchment, Rio Grande do Sul. Moreover, given the absence of studies on Perlidae fecundity for the Neotropical region, especially Anacroneuria, another aim of this study was to determine the realized and potential fecundity of A. trimacula from the metioned State. Adults were collected next to rivers of the region of spring of the Sinos River, with light trap. The adults had been preserved in 80% ethanol and they were observed under a stereomicroscope. Eleven females of Anacroneuria trimacula were dissected to determine the number of eggs and ovarioles. Two new species were described, Anacroneuria fiorentini and A. caraa, and eight more were reported: A. cathia Froehlich 2002, A. debilis (Pictet 1841), A. flintorum Froehlich 2002, A. fuscicosta (Enderlein 1909), A. plaumanni Jewett 1959, A. stanjewetti Froehlich 2002, A. trimacula Jewett 1959, and A. uyara Froehlich 2002. Moreover, in A. trimacula were found 398 mature eggs, on average, ranging from 302 to 491. These values may be considered as the realized fecundity of the species. A great number of ovarioles was found, each with about 9 oocytes. The total number of eggs may be greater than 1500 per female and it corresponds to the potential fecundity of the species.

ASSUNTO(S)

anacroneuria trimacula rio dos sinos rio dos sinos rio grande do sul state estado do rio grande do sul fecundity anacroneuria anacroneuria fecundidade anacroneuria trimacula

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