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Volume 44 - Number 1 - 2009


Osteological analysis in specimens of Fraser's dolphin (Lagenodelphis hosei Fraser, 1956) from the coast of Buenos Aires, Argentina

Sergio O. Lucero1,2, Mónica R. Buono3, Hugo P. Castello4 y Marcela Junin4


1Fundación de Historia Natural "Félix de Azara". Departamento de Ciencias Naturales y Antropología. CEBBAD - Universidad Maimónides. Valentín Virasoro 732 (C1405BDB), Ciudad Autónoma de Buenos Aires, Argentina

2Instituto Fitotécnico de Santa Catalina. Facultad de Ciencias Agrarias y Forestales. Universidad Nacional de La Plata. Ruta 4 Km. 2. C.P. 1836. Llavallol, Provincia de Buenos Aires, Argentina

3Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata. Calles 60 y 122. (1900), La Plata, Argentina

4Laboratorio de Mamíferos Marinos del Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Av. Ángel Gallardo 470, (1405), Buenos Aires, Argentina




The presence of Lagenodelphis hosei in temperate waters of the Argentinian Sea is a rare event because of its preference for pelagic and tropical waters. With the aim to increment the available information on the Fraser´s dolphin in Soutwestern Atlantic waters, we made a morphological and morphometric analysis of skull and postcranial skeleton of five specimens stranded at the end of the 2000 year, in the La Plata River, between Punta Lara and Magdalena localities, at Buenos Aires Province, Argentina. The results were compared with data source from non-South American areas. We observed that specimens of the Southwestern Atlantic described in this study tend to have larger braincase size and the size relation of external nares between males and females is inverse to that seen in specimens of geographically distant areas


Key words: Marine mammals, Delphinidae, Southwestern Atlantic, El Niño, osteology



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