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| Author(s): |
Gabriel Biffi
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) |
| Defense date: | 2017-11-30 |
| Examining board members: |
Sonia Aparecida Casari;
Sergio Ide;
Laura Rocha Prado;
Simone Policena Rosa;
Sergio Antonio Vanin
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| Advisor: | Sonia Aparecida Casari |
| Abstract | |
The subfamily Chauliognathini Champion, 1914 is composed of two tribes: Chauliognathini LeConte, 1861 e Ichthyurini Champion, 1915. In Miskimen\'s (1961) classification the species of each tribe differ in terms of the length of elytra, which may are long, covering the abdomen (Chauliognathini) or very short, exposing the wings and abdominal tergites (Ichthyurini). Alternatively, Magis & Wittmer (1974) proposed that the tribes should be defined based on characters of the abdomen and genitalia of males. In this proposal, part of the Ichthyurini genera was transferred to Chauliognathini. However, a cladistic analysis conducted in order to test the monophyly of Chauliognathini sensu Magis & Wittmer indicated that the group is not monophyletic, recovering the groups according to Miskimen\'s proposal (Biffi 2012). The classification of the genera in Ichthyurini is reliable, with taxonomic revisions available for most of them. However, the taxonomy of Chauliognathini is chaotic, with few genera that do not represent the group\'s morphological diversity accordingly. The approximately 900 species and subspecies are mainly allocated in a single genus, Chauliognathus Hentz, 1830, whose imprecise definition covers all the species of Chauliognathini. A new proposal of homologies for the aedeagus of Chauliognathinae is presented. This is the main structure used by some authors to delimit the tribes and genera. Then, a cladistic analysis of Chauliognathini is proposed in order to verify the phylogenetic positioning of its species and to present morphological characters that may support new classifications for the genera. Species representative of the great morphological diversity and the wide geographic distribution were sampled, including the type species of all genera and subgenera. The results confirm the monophyly of Chauliognathini and Ichthyurini as sister groups, according to Miskimen\'s proposal. We discuss the possibilities of redefining or proposing new genera, with a redistribution of species. Finally, a taxonomic revision of Microdaiphron Pic, 1926, is presented. Ten species are recognized as valid, two of them proposed as new species, and 23 species or subspecies are proposed as synonyms. Redescriptions, illustrations and a distribution map are presented for all species (AU) | |
| FAPESP's process: | 13/08966-1 - Cladistic analysis of Chauliognathini sensu Miskimen (1961) and revision of Microdaiphron PIC, 1926 (Coleoptera, Cantharidae) |
| Grantee: | Gabriel Biffi |
| Support Opportunities: | Scholarships in Brazil - Doctorate |