Chromosomal Variation of Osgoodomys banderanus (Rodentia: Muridae).

Abstract

Summary Chromosomal material from 76 specimens of Osgoodomys banderanus collected in 22 different localities was studied. The revised material was obtained from femur bone marrow from individuals which were previously injected with colchicine. A minimum of 10 mitotic fields were studied for each specimen. A number 2n=48 was found for all the studied specimens. 3 different fundamental numbers and 4 different cytotypes were found 3 of them are not registered yet. Geographical distribution for each cytotype is presented. The G banding pattern was obtained and a cladogram with the possible chromosomal changes is presented.