Morfometria de raias continentais (Chondrichthyes, Potamotrygonidae) do alto rio Paraná, Brasil - DOI: 10.4025/actascibiolsci.v29i4.885

Antonio Guilherme Cândido da Silva; Erivelto Goulart

doi:10.4025/actascibiolsci.v29i4.885

Morphometry of upper Paraná river freshwater stingrays (Chondrichthyes, Potamotrygonidae) - DOI: 10.4025/actascibiolsci.v29i4.885

Antonio Guilherme Cândido da Silva UEM
Erivelto Goulart UEM

DOI: https://doi.org/10.4025/actascibiolsci.v29i4.885

Abstract

Potamotrygonidae is the only extant chondrichthyan group restricted exclusively to freshwater. This family invaded the Upper Paraná river system after the closing of Itaipu Dam. This study aimed to identify morphometric differences between Potamotrygon cf. motoro (Natterer in Müller & Henle, 1841) and Potamotrygon falkneri Castex & Maciel, 1963 sampled in that area, and estimate male size at gonadal maturation. P. falkneri and P. cf. motoro males reach gonadal maturation at 26 cm and 23 cm disc width, respectively. Comparing both species, P. cf. motoro presented larger tail, spiracles and distance between nostrils. Lateral small stings on tails of P. falkneri females were observed as secondary sexual dimorphism. Further studies on functional morphology and ecomorphology may point the meaning of morphometric differences to these species’ ecological interactions.

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Author Biography

Antonio Guilherme Cândido da Silva, UEM

Possui graduação em Ciências Biológicas pela Universidade Estadual de Maringá (2002) e Mestrado em Ciências Ambientais pela mesma Universidade (2006). Atualmente é ativo funcional do Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis - IBAMA. Tem experiência em gestão de Unidades de Conservação da Natureza, em avaliação de danos ambientais e no uso de sistemas de informações georreferenciadas Currículo Lattes

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Published

2008-02-21

How to Cite

Silva, A. G. C. da, & Goulart, E. (2008). Morphometry of upper Paraná river freshwater stingrays (Chondrichthyes, Potamotrygonidae) - DOI: 10.4025/actascibiolsci.v29i4.885. Acta Scientiarum. Biological Sciences, 29(4), 413-419. https://doi.org/10.4025/actascibiolsci.v29i4.885

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Issue

Vol 29 No 4 (2007)

Section

Ecology and Limnology

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