Molecular Biology and Evolution 17:979-983 (2000)
© 2000 Society for Molecular Biology and Evolution
Letter to the Editor |
Where Do Rodents Fit? Evidence from the Complete Mitochondrial Genome of Sciurus vulgaris



*Centro Studio Mitocondri e Metabolismo Energetico, Consiglio Nazionale delle Ricerche, Bari, Italy;
Dipartimento di Biochimica e Biologia Molecolare, Università di Bari, Bari, Italy;
Dipartimento di Fisiologia e Biochimica Generali, Università di Milano, Milano, Italy;
§Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, Centre National de la Recherche Scientifique, Université Montpellier II, Montpellier, France
Nowadays, the order Rodentia represents almost half of all living mammalian species, classified into 3033 families (Hartenberger 1998
), and shows high levels of variability in morphology, habitat utilization, behavior, life history strategy, and geographic distribution (Eisenberg 1981
; Wilson and Reeder 1993
).
Morphological classifications have considered the order Rodentia a monophyletic group on account of dental, cranial, postcranial, and soft anatomical attributes (Luckett and Hartenberger 1993
; Hartenberger 1998
). Nevertheless, this view was challenged in different molecular surveys at the beginning of this decade (Graur, Hide, and Li 1991
; Graur et al. 1992
; Li et al. 1992
). More recent studies have relied on the analysis of complete mitochondrial genomes of four rodent species, namely, rat, mouse, guinea pig, and dormouse, encompassing three major lineages: Muridae, Caviidae, and Gliridae (D'Erchia et al. 1996
; Reyes, Pesole, and Saccone 1998
). Irrespective of the methodological approach,
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