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The chromosomes of sigmodon ochrognathus and sigmodon fulviventer suggest a realignment of sigmodon species groups



The chromosomes of sigmodon ochrognathus and sigmodon fulviventer suggest a realignment of sigmodon species groups



Journal of Mammalogy 66(3): 511-518



The G- and C-banded karyotypes of S. ochrognathus (2n = 52) and S. fulviventer (2n = 28, 29, 30) are presented and compared to S. hispidus (2n = 52), which is representative of the ancestral chromosomal type. S. ochrognathus differs form S. hispidus only by the addition of heterochromatic short arms on 8 pairs of chromosomes. S. fulviventer possesses 3 unique chromosomes and lacks homologous counterparts for 10 chromosomes found in S. hispidus. The available cytogenetic and immunological evidence suggests that S. fulviventer represents an evolutionary lineage well removed from all over North American species. S. hispidus, S. leucotis, S. allenti, S. ochrognathus, S. arizonae and S. mascotensis comprise a species group and that S. fulviventer should be recognized as a separate monotypic species group.

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Accession: 006614810

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Related references

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