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The higher-level phylogenetics of Gymnotiformes (Teleostei: Ostariophysi) based on morphological evidence

Grant number: 19/26594-0
Support type:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): June 15, 2021
Effective date (End): December 14, 2021
Field of knowledge:Biological Sciences - Zoology - Morphology of Recent Groups
Principal researcher:Aléssio Datovo da Silva
Grantee:Luiz Antonio Wanderley Peixoto
Supervisor abroad: Lynne R. Parenti
Home Institution: Museu de Zoologia (MZ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: Smithsonian National Museum of Natural History, United States  
Associated to the scholarship:18/05084-1 - Evolution of the skeletal musculature of the Gymnotiformes (Teleostei: Ostariophysi), BP.PD

Abstract

The aim of this project is to perform a thorough phylogenetic analysis in phylogenetically-relevant taxa of the order Gymnotiformes. The study intends to revaluated all morphological characters proposed in previous cladistic studies and provide a detailed record of the variation in the external anatomy and osteology within each gymnotiform subgroup. The descriptive portion of the work will include anatomical illustrations of all relevant structures using modern techniques, and the coded characters will comprise an updated morphological dataset, which will be analyze under different optimality criteria (Bayesian and Parsimony analyses). The new hypothesis of phylogenetic relationships in Gymnotiformes will serve as basis to a new classification, besides providing a new interpretation on electric signals' evolution or biogeographic patterns in the group. In addition, the new morphology-based matrix will be used as a reliable source of data to concatenate the myology characters that resulted from the main project, in order to evaluate the impact of the newly myological characters on the new database. Results will contribute significantly towards the understanding of the evolution of Gymnotiformes, and help elucidating the phylogenetic relationships of major components of the continental fish fauna. These results should thus fill gaps in our knowledge of anatomy and interrelationships of important components of the freshwater ichthyofauna. (AU)

News published in Agência FAPESP Newsletter about the scholarship: