New data of the long-clawed mouse Pearsonomys annectens

G. D’ELI´A; AGUSTINA A. OJEDA; F. MONDACA; M.H. GALLARDO

ZEITSCHRIFT FUR SAUGETIERKUNDE-INTERNATIONAL JOURNAL OF MAMMALIAN BIOLOGY

Elsevier

Año: 2006 vol. 71 p. 39 - 51

0044-3468

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 mesolophid), penis (complex type), stomach (unilocularhemiglandular), and karyotype (2n=56; FN=62). The discussion of these new data is framed according the results of the phylogenetic analysis.