Project 554: A. R. Percequillo, M. Weksler, L. P. Costa. 2011. A new genus and species of rodent from the Brazilian Atlantic Forest (Rodentia: Cricetidae: Sigmodontinae: Oryzomyini), with comments on oryzomyine biogeography. Zoological Journal of the Linnean Society. 161 (2):357-390.
Specimen: Drymoreomys albimaculatus (MZUSP:34716)
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We describe in this paper a new genus and species of cricetid rodent from the Atlantic Forest of Brazil, one of the most endangered eco-regions of the world. The new form displays some but not all synapomorphies of the tribe Oryzomyini, but a suite of unique characteristics is also observed. This new forest rat possesses anatomical characteristics of arboreal taxa, such as very developed plantar pads, but was collected almost exclusively in pitfall traps. Phylogenetic analyses of morphological (integument, soft tissue, cranial, and dental characters) and molecular [nuclear – Interphotoreceptor retinoid binding protein (Irbp) – and mitochondrial – cytochrome b– genes] datasets using maximum likelihood and cladistic parsimony approaches corroborate the inclusion of the new taxon within oryzomyines. The analyses also place the new form as sister species to Eremoryzomys polius, an Andean rat endemic to the Maranon valley. This biogeographical pattern is unusual amongst small terrestrial vertebrates, as a review of the literature points to few other similar examples of Andean–Atlantic Forest pairings, in hylid frogs, Pionus parrots, and other sigmodontine rodents.

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Project DOI: 10.7934/P554,
This project contains
  • 1 Media
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MorphoBank Project 554
  • Creation Date:
    19 July 2011
  • Publication Date:
    25 September 2019
  • Project views: 5021

    Authors' Institutions

    • American Museum of Natural History

    • Universidade de Sao Paulo (USP, University of Sao Paulo)

    • Universidade Federal do Espirito Santo


    member name taxa specimens media
    MorphoBank Curator
    Project Administrator
    Maureen Admin
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    Alexandre Percequillo
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    Marcelo Weksler
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