A new species of sigmodontine rodent from the Atlantic forest of Eastern Brazil

• Autorzy: De O. J. A. , Bonvicino C.R.
• Języki publikacji: EN

Abstrakty

EN

We describe a new sigmodontine species on the basis of three specimens obtained from a high-altitude locality in the Atlantic forest of eastern Brazil. This new form, a small-bodied pentalophodont with tail longer than head and body, long soft fur, and a brownish ochraceous dorsum, is diagnosed by the presence of an open slit in the suture between the frontal bones in prepared skulls, and by a reduced diploid number of 20 coupled with a relatively high fundamental number of 34. Although the low diploid number suggests a derived sigmodontine, analyses of morphological characters and DNA sequence data (720 bp of the cytochrome-6 gene) point to its placement within the recently described genus Juliomys González, 2000, a taxon regarded as belonging to an old and independent sigmodontine lineage. This finding reinforces current hypotheses of the Atlantic forest domain as an important center of diversification for a primitive sigmodontine stock. It also suggests that at least some surviving lineages, often considered rather ancient and unspeciose relicts, were subject to relatively more recent speciation events.

Słowa kluczowe

EN

cytochrome b; Eastern Brazil; Sigmodontinae; Brazil; new species; karyotype; rodent; Wilfredomys; Juliomys; Atlantic forest; sigmodontine rodent

• Wydawca: -
• Czasopismo: Acta Theriologica
• Rocznik: 2002
• Tom: 47
• Numer: 3
• Opis fizyczny: p.307-322,fig.,ref.

Twórcy

autor

De O. J. A.

• Universidade Federal do Rio de Janeiro, Quinta da Boa Vista s/n, 20940-040, Rio de Janeiro, Brazil

autor

Bonvicino C.R.

Bibliografia

• Avila-Pires F. D. 1960. A new genus of South American rodent. Boletim do Museu Nacional 220: 1-6. [In Portuguese with English summary]
• Bonvicino C. R. and Geise L. 1995. Taxonomic status of Delomys dorsalis collinus Thomas, 1917 (Rodentia, Cricetidae) and description of a new karyotype. Zeitschrift für Säugetierkunde 60: 124-127.
• Bonvicino C. R., Oliveira J. A., D'Andrea P. S. and Carvalho R. W. 2001. The endemic Atlantic forest rodent Phaenomys ferrugineus (Sigmodontinae): New data on its morphology and karyology. Boletim do Museu Nacional 467: 1-12.
• Bonvicino C. R. and Otazu I. B. 1999. The Wilfredomys pictipes (Rodentia: Sigmodontinae) karyotype with comments on the karyosystematics of Brazilian Thomasomyini. Acta Theriologica 44: 329-332.
• Cabrera A. 1961. Catálogo de los mamíferos de América del Sur. Revista del Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Ciencias Zoológicas 4: 309-732.
• Carleton M. D. and Musser G. G. 1989. Systematic studies of oryzomyine rodents (Muridae, Sigmo­dontinae): a synopsis of Microryzomys. Bulletin of the American Museum of Natural History 191: 1-83.
• Ellerman J. R. 1941. The families and genera of living rodents. Family Muridae. Jarrold and Sons Ltd., Norwich: xii + 1-690.
• Gardner A. L. and Patton J. L. 1976. Karyotypic variation in oryzomyine rodents (Cricetinae) with comments on chromosomal evolution in the Neotropical cricetine complex. Occasional Papers of the Museum of Zoology - Louisiana State University 49: 1-48.
• Gómez-Laverde M., Montenegro-Díaz O., López-Arévalo H., Cadena A., and Bueno M. L. 1997. Karyology, morphology, and ecology of Thomasomys laniger and T. niveipes (Rodentia) in Colombia. Journal of Mammalogy 78: 1282-1289.
• González E. M. 2000. Un nuevo género de roedor sigmodontino de Argentina y Brasil (Mammalia: Rodentia: Sigmodontinae). Comunicaciones Zoológicas del Museo de Historia Natural de Montevideo 12: 1-12.
• González E. M. and González S. 1998. El cariotipo de Wilfredomys oenax (Thomas, 1928) (Rodentia, Sigmodontinae) con comentarios sobre la evolución y la posición taxonómica de Wilfredomys Avila Pires, 1960. Jornadas Argentinas de Mastozoología, Resúmenes: 34.
• Gyldenstolpe N. C. G. 1932. A manual of Neotropical sigmodont rodents. Kungliga Svenska Vetens- kapsakad. Handlingar Series 3B. 3: 1-164.
• Hershkovitz P. 1998. Report of some sigmodontine rodents collected in southeastern Brazil with description of a new genus and six new species. Bonner Zoologische Beitraege 47: 193-256.
• Kumar S., Tamura K. and Nei M. 1993. MEGA: Molecular evolutionary genetics analysis, version 1.01. The Pennsylvania State University, University Park, PA.
• Marshall L. G. 1979. A model for paleobiogeography of South American cricetine rodents. Paleobiology 5: 126-132.
• Musser G. G. and Carleton M. D. 1993. Family Muridae. [In: Mammal species of the World: a taxonomic and geographic reference. D. E. Wilson and D. M. Reeder, eds]. Smithsonian Institution Press, Washington: 501-755.
• Osgood W. H. 1933. Two new rodents from Argentina. Zoological Series of Field Museum of Natural History 20: 11-14.
• Reig O. A. 1984. Geographic distribution and evolutionary history of South American muroids, Cricetidae: Sigmodontinae. Revista Brasileira de Genética 7: 333-365. [In Portuguese with English summary]
• Ridgway R. 1912. Color standards and nomenclature. Published by the Author, Washington, D.C.: iii + 1-43 (+ 53 colored plates).
• Sambrook J., Fritsch E. F. and Maniatis T. 1989. Molecular cloning: a laboratory manual. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York: 1-591.
• Simpson G. G. 1945. The principles of classification and a classification of mammals. Bulletin of the American Museum of Natural History 85: 1-350.
• Smith M. F. and Patton J. L. 1993. The diversification of South American murid rodents: Evidence from mitochondrial DNA sequence data for the akodontine tribe. Biological Journal of the Linnean Society 50: 149-177.
• Smith M. F. and 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.
• Steppan S. J. 1995. Revision of the tribe Phyllotini (Rodentia: Sigmodontinae), with a phylogenetic hypothesis for the Sigmodontinae. Fieldiana Zoology 80: 1-112.
• Svartman M. 1989. [Karyological survey in rodents of the Federal District region]. MSc thesis, Universidade de Sao Paulo, Sao Paulo: 1-217. [In Portuguese]
• Thomas O. 1906. Notes on South-American rodents. Annals and Magazine of Natural History, Series 7, 18: 442-448.
• Thomas O. 1917. On the arrangement of the South American rats allied to Oryzomys and Rhipidomys. Annals and Magazine of Natural History, Series 8, 20: 192-198.
• Thomas O. 1928. A new Thomasomys from Rio Grande do Sul. Annals and Magazine of Natural History, Series 10, 1: 154-155.
• Tribe C. J. 1996. The Neotropical rodent genus Rhipidomys (Cricetidae: Sigmodontinae) - a taxonomic revision. PhD thesis, University College London, London: 1-316.
• Trouessart E.-L. 1904. Catalogus mammalium tam viventium quam fossilium. Quinquennale sup- plementum. R. Friedländer & Sohn, Berlin: 1-546.
• Voss R. S. 1988. Systematics and ecology of ichthyomyine rodents (Muroidea): patterns of morphological evolution in a small adaptive radiation. Bulletin of the American Museum of Natural History 188: 259-493.
• Voss R. S. 1991. An introduction to the Neotropical muroid rodent genus Zygodontomys. Bulletin of the American Museum of Natural History 210: 1-113.
• Voss R. S.1993. A revision of the Brazilian muroid rodent genus Delomys with remarks on "Thomaso- myine'' characters. American Museum Novitates 3073: 1-44.
• Voss R. S. and Carleton M. D. 1993. A new genus for Hesperomys molitor Winge and Holochilus magnus Hershkovitz (Mammalia, Muridae) with an analysis of its phylogenetic relationships. American Museum Novitates 3085: 1-39.
• Weksler M., Geise L. and Cerqueira R. 1999. A new species of Oryzomys (Rodentia, Sigmodontinae) from southeast Brazil, with comments on the classification of the O. capito species group. Zoological Journal of the Linnean Society 125: 445-462.
• Zanchin N., Langguth A. and Mattevi M. S. 1992a. Karyotypes of Brazilian species of Rhipidomys (Rodentia, Cricetidae). Journal of Mammalogy 73: 120-122.
• Zanchin N., Sbalqueiro I. J., Langguth A., Bossle R. C., Castro E. C., Oliveira L. F. B. and Mattevi M. 1992b. Karyotype and species diversity of the genus Delomys (Rodentia, Cricetidae) in Brazil. Acta Theriologica 37: 163-169.