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Artigo Produção Nacional Revisado por pares
BIBTEX RIS

Karyologic evidence of diversification of the genus <i>Thrichomys</i> (Rodentia, Echimyidae)

2002; Karger Publishers; Volume: 97; Issue: 3-4 Linguagem: Inglês

10.1159/000066613

ISSN

1424-8581

Autores

Cibele Rodrigues Bonvicino, I.B. Otazú, Paulo Sérgio D’Andrea,

Tópico(s)

Chromosomal and Genetic Variations

Resumo

Karyologic analysis of <i>Thrichomys</i> specimens from different Brazilian localities, in Pantanal, Cerrado and Caatinga biomes, shows different chromosome complements. The 2n = 34, FN = 64 karyotype is found in Mato Grosso do Sul state; the 2n = 30, FN = 54 karyotype in Bahia, Pernambuco, Piauí and Ceará states; the 2n = 30, FN = 56 karyotype in Goiás and Tocantins states, the 2n = 28, FN = 50 karyotype in Minas Gerais state, the 2n = 28, FN = 52 and 2n = 26, FN = 48 karyotypes in Bahia state. Comparisons of G-band patterns allowed the identification of homologies shared by all karyotypes and show that the two karyotypes with the lowest diploid number (2n = 26 and 2n = 28) belong to two different evolutionary lineages. The most proper names for each karyomorphic population are: <i>Thrichomys pachyurus</i> for 2n = 34; <i>Thrichomys apereoides apereoides</i> for 2n = 28, FN = 50; <i>Thrichomys apereoides laurentius</i> for 2n = 30, FN = 54 and <i>Thrichomys inermis</i> for 2n = 26. Two karyotypes (2n = 28, FN = 52 and 2n = 30, FN = 56) could not be attributed to any subspecies. These different karyomorphotypes are allopatric and/or parapatric.

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