Cytogenetics of South American Akodont Rodents (Cricetidae): New Karyotypes and Chromosomal Banding Patterns of Argentinian and Uruguayan Forms

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Abstract
Cytogenetic analysis was performed in Akodon (Akodon) puer (= Akodon coenosus), Akodon azarae bibianae, Akodon (Hypsimys) budini, Bolomys temchuki elioi, Bolomys temchuki liciae, Oxymycterus rufus rufus, Oxymycterus ruf us platensis, and Oxymycterus paramensis. Diploid numbers, chromosomal morphology, and lengths and banding patterns (G and C) were determined for each taxon. Chromosomal number and gross morphology are also described in topotypical specimens of Akodon (Akodon) arenicola (=Akodon (Akodon) azarae azarae) and Oxymycterus nasutus. A 2n = 34 karyotype, similar to one previously reported as Akodon coenosus, was confirmed in Akodon puer. A. budini showed a 2n = 38 karyotype peculiar within the genus as regards chromosomal morphology and C bands. A. a. bibianae has a 2n = 38 karyotype closely related with that of A. a. azarae. The two subspecies of B. temchuki, which differ strikingly in fur color, showed an identical 2n = 34 karyotype, which was quite similar in diploid number, chromosomal morphology, and banding patterns to that reported for B. lasiurus, but was different in the morphology of the Y and in G and C bands when compared with B. obscurus from the south of Buenos Aires Province. The three species of Oxymycterus, which markedly differ in morphometric character states, showed an identical 2n = 54 karyotype, and no banding differences were observed between O. rufus and O. paramensis.