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    A newly recognized clade of trans-Andean Oryzomyini (Rodentia: Cricetidae), with description of a new genus.

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    Issue Date
    2012-06
    Author
    Pine, Ronald H.
    Timm, Robert M.
    Weksler, Marcelo
    Publisher
    Journal of Mammalogy
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    We expand upon recent studies on relationships within the Oryzomyini, in particular, those involving taxa currently assigned to the genus Sigmodontomys. In recent years, Sigmodontomys has been treated as including 2 species, alfari (J. A. Allen, 1897) and aphrastus (Harris, 1932), but throughout their complicated taxonomic history both species also have been placed in the genus Oryzomys, and alfari independently in Nectomys. Using morphological (98 external, cranial, dental, and postcranial) and molecular (nuclear interphotoreceptor retinoid-binding protein gene and mitochondrial cytochrome-b and ribosomal 12S RNA genes) characters, we infer the phylogenetic position of these 2 species within Oryzomyini. We document that alfari and aphrastus do not form a monophyletic group. Sigmodontomys alfari is most closely related to Melanomys, and aphrastus is either the sister to that clade, or to the extinct Caribbean genus Megalomys. Thus, aphrastus is best regarded as representing a new genus, which is described and named herein. This new genus falls within the Sigmodontomys–Melanomys–Aegialomys–Nesoryzomys clade, which forms a monophyletic group of mainly southern Central American and northern South American taxa primarily restricted to lowland to midelevation montane trans-Andean habitats and possessing a marked ability to cross expanses of salt water. The new genus occurs in middle elevations from north-central Costa Rica to northwestern Ecuador and along with some populations of Aegialomys and Melanomys occupies the highest elevations for members of this group. Resumen—A partir de estudios recientes, profundizamos acerca de las relaciones filogenéticas dentro de Oryzomyini (Rodentia: Cricetidae), en particular aquellas que involucran taxa actualmente atribuidos al género Sigmodontomys. Recientemente se ha considerado que Sigmodontomys incluye dos especies—alfari (J. A. Allen, 1897) y aphrastus (Harris, 1932), sin embargo, a través de su complicada historia taxonómica, ambas especies también han sido incluidas dentro del género Oryzomys, y alfari independientemente dentro del género Nectomys. Usando caracteres morfológicos (98 externos, craneales, dentales y postcraneales) y moleculares (citocromo b, 12S y IRBP), inferimos la posición filogenética de estas dos especies dentro de Oryzomyini. Documentamos que alfari y aphrastus no forman un grupo monofilético. Sigmodontomys alfari es el taxón hermano de Melanomys, mientras aphrastus es hermano de dicho grupo, o del género caribeño extinto Megalomys. Por consiguiente, consideramos a aphrastus como un nuevo género que describimos y nombramos a continuación. Este nuevo género está incluido dentro del clado formado por Sigmodontomys–Melanomys–Aegialomys–Nesoryzomys, el cual representa un grupo monofilético bien sustentado principalmente del sur de Centroamérica y norte de Sudamérica, restringido principalmente a hábitats de tierras bajas a elevaciones intermedias trasandinas, y caracterizado por su habilidad de cruzar barreras de agua salada. El nuevo género se encuentra en elevaciones medianas y altas desde el centro y norte de Costa Rica hasta el noroeste de Ecuador y, junto con algunas poblaciones de Aegialomys y Melanomys, ocupa las elevaciones más altas de cualquier miembro de este grupo.
    URI
    http://hdl.handle.net/1808/9974
    Collections
    • Center for Latin American and Caribbean Studies Scholarly Works [738]
    • Ecology & Evolutionary Biology Scholarly Works [1516]
    Citation
    Pine, R. H., R. M. Timm, and M. Weksler. 2012. A newly recognized clade of trans-Andean Oryzomyini (Rodentia: Cricetidae), with description of a new genus. Journal of Mammalogy 93(3):851-870.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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