For Manuscript Submission, Check or Review Login please go to Submission Websites List.
For the academic login, please select your country in the dropdown list. You will be redirected to verify your credentials.
Karyologic evidence of diversification of the genus Thrichomys (Rodentia, Echimyidae)Bonvicino C.R.a,b · Otazu I.B.a,c · D’Andrea P.S.b
aGenetics Division, Instituto Nacional de Câncer; bTropical Medicine Department, Instituto Oswaldo Cruz; cDepartment of Genetics, Universidade Federal do Rio de Janeiro, Rio de Janeiro (Brazil)
Karyologic analysis of Thrichomys 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: Thrichomys pachyurus for 2n = 34; Thrichomys apereoides apereoides for 2n = 28, FN = 50; Thrichomys apereoides laurentius for 2n = 30, FN = 54 and Thrichomys inermis 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.
© 2002 S. Karger AG, Basel