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Phylogenetic relationships in Xenurobrycon Myers & Miranda-Ribeiro and discussion on miniaturization in the genus (Stervardiinae: Characidae: Characiformes)

Grant number: 18/23354-6
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): March 01, 2019
Effective date (End): October 31, 2019
Field of knowledge:Biological Sciences - Zoology - Taxonomy of Recent Groups
Principal Investigator:Manoela Maria Marinho Koh
Grantee:Péricles Vinícius Gentile
Host Institution: Museu de Zoologia (MZ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:17/09321-5 - Miniature Characiformes (Teleostei: Ostariophysi): evolution, diversity and biogeography, AP.BTA.JP


Xenurobrycon, a genus of Xenurobryconini, Stervardiinae, includes six miniature species that occur in the basin of Amazon river and Paraguay. Although the intergeneric relations of Xenurobryconini were evaluated in previous phylogenetic studies, there is not any well-known study focused to understand the relations between the species of Xenurobrycon. Moreover, these individuals give a series of characteristics probably related to the small size. This present proposal aims to elucidate the kinship relations of these specimens by means of phylogenetic analysis and assess the anatomical reductive structures of Xenurobrycon in a comparative analysis with the ontogenetic sequence of a basal Characidae, Salminus brasiliensis, in order to understand if these characteristics are results of the miniaturization's evolution in the tribe.

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