The Chromosomes of some octodontids with special reference to Octodontomys (Rodentia; Hystricomorpha) |
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| Authors: | Wilma George Barbara J. Weir |
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| Affiliation: | (1) Lady Margaret Hall, Oxford and Wellcome Institute of Comparative Physiology, Zoological Society of London, London |
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| Abstract: | The chromosomes of three species (Octodontomys gliroides, Octodon degus and Ctenomys talarum) of octodontid hystricomorph rodents are compared. — The diploid numbers are 38, 58 and 48 respectively. No polymorphic chromosomes were noted in the specimens available. The sex chromosomes are heteromorphic and pair end to end in meiosis. — The karyotypes are compared on the basis of the extreme specialisation of the habitat of the three species. The asymmetric karyotype of Octodontomys can be compared more readily with that of a Ctenomys ancestor than with that of its present-day relative, Octodon. |
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