Evolutionary relationships based on genetic and phenetic characters between Triatoma maculata, Triatoma pseudomaculata and morphologically related species (Reduviidae: Triatominae)

The maculata group currently comprises two species of Triatominae, Triatoma maculata and Triatoma pseudomaculata, which share morphologic and chromatic characteristics. In order to clarify the systematic status of these two vectors of Trpanosoma cruzi and to infer their evolutionary relationships, we performed an enzymatic, morphometric and cytogenetic comparison of them, also taking into account two sister species not included in the group (T. arthurneivai and T wygodzinskyi). According to our results, T maculata and T pseudomaculata belong to distinct evolutionary lineages. Similarly, T arthurneivai topotypes from Minas Gerais form an independent isolated group by morphometrics. Our results also support the specific status of the Triatoma population from Sao Paulo State (formerly referred to T arthurneivai), and suggest the possibility that it is T wygodzinskyi. Finally, we suggest that only the arboricolous T pseudomaculata from northeast Brazil and the repicolous sister species originated from Paulo State should be classified together in the same group. (c) 2007 Elsevier B.V. All rights reserved.