Evolutive pattern of Calomys hummelincki (Husson, 1960; Rodentia, Sigmodontinae) inferred from cytogenetic and allozymic data.
2002
The main purpose of this research was to understand the evolutive history of
the sigmodontine rodent Calomys hummelincki (Husson 1960), tribe Phyllotini from chromosomal
and allozymic data, and evaluate the hypotheses that explains the colonization and
evolution of sigmodontine rodents in South America. C. hummelincki is restricted to the
Northern South American region, which comprises Venezuela, Aruba and Curacao islands
where specimen sampling was done. The cytogenetic analysis showed that all populations
studied have the same diploid number (2n=60) and fundamental number (FN=64). Constitutive
heterochromatin was observed on pericentromeric positions in almost all chromosomes.
NOR regions were observed on four pairs of acrocentric chromosomes. G-banding allowed
us to identify almost all pair positions in the C. hummelincki chromosome complement. The
G-banding also permitted a comparison of the C. hummelincki pattern with those published
for C. callidus, C. venustus and C. laucha species. G-banded information indicates that
hummelincki is not directly derived from laucha. The results are constrained with published
allozymic and molecular data obtained in previous studies. The overall analysis seems to
support Reig´s hypothesis of a south to north colonization of genus Calomys in South
America.
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