Karyologic diversification and phylogenetic relationships of the genus Thalpomys (Rodentia, Sigmodontinae)

• Autorzy: De A. A. F. B. , Bonvicino C.R. , Briani D.C. , Kasahara S.
• Języki publikacji: EN

Abstrakty

EN

We describe the karyotype of Thalpomys species, from different Brazilian localities of the Cerrado. Thalpomys cerradensis Herskovitz, 1990 showed 2n = 36, FN = 34 and T. lasiotis Thomas, .1916 2n = 38, FN = 38. Comparisons of G-band karyotypes showed evident inter-specific homologies indicating that their chromosome complements could be derived from one another by two presumed rearrangements. Both species showed pericentromeric C-band regions in almost all chromosomes but a comparison with CMA3/DA/DAPI staining indicated that the molecular content of heterochromatic regions was different. T. lasiotis specimens from two different localities differed in the morphology of the X chromosome due to the presence of a short heterochromatic arm. These chromosome types are apparently fixed in each population rather than maintained as a polymorphic variation. Phylogenetic analyses supported the monophyly of the genus Thalpomys but was not capable of elucidating its phylogenetic relationship to other Akodontini rodents. These analyses also showed inter-individual variation in T. lasiotis, even within a given population. Phylogenetic analyses placed T. lasiotis specimens with different karyotypes in different monophyletic branches. Molecular and karyologic data confirmed the identity of the genus Thalpomys.

Słowa kluczowe

EN

phylogenesis; Sigmodontinae; Rodentia; Brazil; Thalpomys; karyotype; rodent; distribution

• Wydawca: -
• Czasopismo: Acta Theriologica
• Rocznik: 2004
• Tom: 49
• Numer: 2
• Opis fizyczny: p.181-190,fig.,ref.

Twórcy

autor

De A. A. F. B.

• Universidade Estadual Paulista, Rio Claro, SP, Brazil

autor

Bonvicino C.R.

autor

Briani D.C.

autor

Kasahara S.

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