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Taxonomic revision and cladistic analysis of the genus Ormiophasia Townsend, 1919 (Diptera, Tachinidae, Ormiini)

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Filipe Macedo Gudin
Total Authors: 1
Document type: Master's Dissertation
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Instituto de Biociências
Defense date:
Examining board members:
Silvio Shigueo Nihei; Eduardo Andrade Botelho de Almeida; Carlos José Einicker Lamas
Advisor: Silvio Shigueo Nihei

Tachinidae is a large family of Diptera and all species are parasitoids of arthropods. Their classification is complex and confused, though, especially in Neotropical Region. Tachinidae is classified into Dexiinae, Phasiinae, Exoristinae and Tachininae, the latter including the tribe Ormiini. Ormiine flies occur worldwide and locate hosts (Orthoptera, Ensifera) phonotactically. They have an inflated prosternum with an acoustic membrane. Ormiophasia Townsend includes nine species and it is endemic to the Neotropical Region. Its validity have been questioned by many authors, and even considered a junior synonym of Ormia Robineau-Desvoidy. This study aims to revise the genus, to test the monophyly of Ormiophasia and to reconstruct the phylogenetic relationships among the recognized species. A total of 319 specimens were examined from six Brazilian and five international institutions. Cladistic analysis was carried out with TNT. Characters were initially treated with equal weights and unordered. Analysis under implied weighting of the characters was made to assess the fitness and information of homoplastic characters. Data matrix was made in Mesquite 2.75, with 15 species of Ormiophasia and 17 outgroup taxa, and 27 morphological characters. Glaurocara flava (Glaurocarini) was used as root. It was recognized 8 valid species of Ormiophasia, with one sinonimy proposed: O. travassosi jr. syn. of O. inflate. Eight new species of Ormiophasia are described. As results of the cladisic analysis, Ormiini is divided into two distinct clades: the Old World clade and the New World clade, which includes Ormia and Ormiophasia. Ormiophasia is a monophyletic genus, with at least three synapomorfies and high support values. Female terminalia and first instar larvae characters were very important to give resolution to Ormiini and Ormiophasia topologies (AU)

FAPESP's process: 12/17847-3 - Taxonomic revision and cladistic analysis of Ormiophasia Townsend, 1919 (Diptera, Tachinidae, Ormiini).
Grantee:Filipe Macedo Gudin
Support type: Scholarships in Brazil - Master