Abstract
Molecular (cytochrome b) comparisons between topotypical specimens of Brucepattersonius griserufescens and the holotype of B. albinasus, both described from the same locality in southeastern Brazil, reveal a very low estimate of genetic distance, equivalent to those obtained in comparisons between haplotypes of B. griserufescens. Only six variable sites, five transitions and one transversion, were found among the 1040 bp of all haplotypes. These findings, together with a re-evaluation of the morphological characters on which the distinction between the two nominal forms was based, indicate that only one evolutionary lineage is represented, which must bear the name B. griserufescens, with B. albinasus as a junior synonym.References
Applied Biosystems (1994) Sequence Navigator, DNA and Protein Comparison Software. A Division of Perkin-Elmer Corporation.
Axenovich, T.I., D’Andrea, P.S., Fernandes, F., Bonvicino, C.R., Zorkoltseva, I.V. & Borodin, P.M. (2004) Inheritance of white head spotting in natural populations of South American water rat (Nectomys squamipes Rodentia: Sigmodontinae). Journal of Heredity, 95 (1), 76–80.
Bonvicino, C.R., Penna-Firme, V. & Seuánez, H.N. (1998) The karyotype of Brucepattersonius griserufescens Hershkovitz. 1998 (Rodentia, Sigmodontinae) with comments on distribution and taxonomy. Zeitschrift fur Säugetierkunde, 63 (6), 329–335.
Bonvicino, C.R. & Moreira, M.A.M. (2001) Molecular phylogeny of the genus Oryzomys (Rodentia: Sigmodontinae) based on Cytochrome b sequence data. Molecular Phylogenetic Evolution, 18, 282–292.
D´Elía, G. (2003) Phylogenetics of Sigmodontinae (Rodentia, Muroidea, Cricetidae), with special reference to the akodont group, a with additional comments on historical biogeography. Cladistics, 19, 307–323.
Hershkovitz, P. (1998) Report on some sigmodontine rodents collected in southeastern Brazil with descriptions of a new genus and six new species. Bonner Zoologische Beiträge, 47 (3–4), 193–256.
ICZN. (1999) International Code of Zoological Nomenclature, 4th ed. London: International Trust for Zoological Nomenclature.
Kumar, S., Tamura, K., Jakobson, I.B. & Nei., M. (1993) MEGA: Molecular Evolutionary Genetics Analysis, Version 1.02. Pennsylvania State University, University Park.
Lanave, C., Preparata, G., Saccone, C. & Serio, G. (1984) A new method for calculating evolutionary substitution rates. Journal of Molecular Evolution 20, 86–93.
Mares, M. & Braun, J.K. (2000) Three new species of Brucepattersonius (Rodentia:Sigmodontinae) from Missiones province, Argentina. Occasional Papers Sam Noble Oklahoma Museum of Natural History, 9, 1–13.
Posada, D. & Crandall, K.A. (1998) MODELTEST: testing the model of DNA substitution. Bioinformatics Applications Note, 14 (9),817–818.
Sambrook, J., Fritsch, E.F. & Maniatis, T. (1989) Molecular Cloning: A Laboratory Manual. Cold Spring Harbor Laboratory Press, Cold Spring Harbor. 3v.
Smith, M.F. & Patton, J.L. (1999) Phylogenetic relationships and the radiation of sigmodontine rodents in South America; evidence from cytochrome b. Journal of Mammalian Evolution, 6, 89–128.
Swofford, D.L. (1993) “PAUP*: Phylogenetic Analysis Using Parsimony (*and other methods), version 4.0b10”, Washington, Smithsonian Institution Press.
Thomas, O. (1896) On new small mammals form the Neotropical region. Annals and Magazine of Natural History, 6 (18), 301–314.
Vilela, J.F. (2005) Filogenia molecular de Brucepattersonius (Sigmodontinae: Akodontini) com uma análise morfométrica craniana do gênero. MSc Thesis, Universidade Federal do Rio de Janeiro - Museu Nacional, Rio de Janeiro, xvi+67 pp.