IADIZA - GIB ACTIVIDADES Difusion Pearsonomys
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New data of the long-clawed mouse Pearsonomys annectens (Cricetidae, Sigmodontinae)
The monotypic genus Pearsonomys is one of the least studied sigmodontine genera, so far known only from its holotype. We record four new localities from the Region de Los Lagos (southern Chile) for P. annectens expanding its known distribution by approximately 217 km. Next, we present a phylogenetic analysis based on nuclear DNA sequences aimed to test the phylogenetic position of Pearsonomys. Results of this analysis corroborate that Pearsonomys belongs to the abrotrichine radiation being sister of Geoxus. Subsequently, we provide descriptions of P. annectens molars (tetralophodont pattern with reduced mesoloph/id), penis (complex type), stomach (unilocularhemiglandular), and karyotype (2n=56; FN=62)(Guillermo D’Elía, Agustina A. Ojeda, Fredy Mondaca and Milton H. Gallardo. Sección Evolución, Facultad de Ciencias, Montevideo, Uruguay; Grupo de Investigación en Biodiversidad,Instituto Argentino de Investigaciones de Zonas Aridas, CONICET, Mendoza, Argentina; and Instituto de Ecología y Evolución, Universidad Austral de Chile, Valdivia, Chile; Mammalian Biology on line www.elsevier.de/mambio; presentado en las XX Jornadas de SAREM, noviembre 2005, BsAs,Argentina;)
