Análise filogenética das espécies de Castoraeschna Calvert, 1952 (Insecta, Odonata, Aeshnidae)

Abstract

Cladistic analysis including adult representatives of the eight described species of Castoraeschna and four species of the related genera Coryphaeschna, Remartinia and Rhionaeschna, based on 118 morphological characters, is presented. Four different fully resolved trees were obtained using the algorithm bb of the PAUP* (steps = 285; CI = 0,551; RI = 0,565). The strict consensus tree has the following topology: ( C. colorata, C. margarethae, C. pseudocolorata (C. coronata, C. tepuica (C. castor, C. areal)) (C. longfieldae, C. itatiaia, C. Januaria, C. decurvata)). Castoraeschna is hypothesized as a monophyletic group based on 11 exclusive apomorfies: antehumeral stripes distinctly narrower than half of the width of mesepimeron; posterior surface of femora I with very small, or absent pale spot; anterior region of abdominal sternite 1 densely covered by hairs; postero-ventral angles of abdominal tergite 1 well developed, projected inner and / or ventrally; internal border of hamuli anteriores little widened; base of genital lobe without pale spots; pale spots AL on abdominal tergites 6 and 7 on males not restricted to the anterior limit of these segments; male cerci with very long hairs, approximately in Iength or longer than the width of the lamina; bases of male cerci divergent, in dorsal view; male cerci with the apex swallowed; female dentigerous plate divided in two lobes. For the first time characters based on abdominal color pattern were extensively used in a phylogenetic analysis in Odonata.