Journal of Mammalian Evolution

, Volume 4, Issue 4, pp 259–269

Chromosome Divergences Among American Marsupials and the Australian Affinities of the American Dromiciops

Authors

    • Instituto de Ciencias Biomédicas, Programa de Genética Humana, Facultad de MedicinaUniversidad de Chile, Casilla
  • Juan C. Marin
    • Instituto de Ciencias Biomédicas, Programa de Genética Humana, Facultad de MedicinaUniversidad de Chile, Casilla
  • Marco Yévenes
    • Instituto de Ciencias Biomédicas, Programa de Genética Humana, Facultad de MedicinaUniversidad de Chile, Casilla
  • Laura I. Walker
    • Instituto de Ciencias Biomédicas, Programa de Genética Humana, Facultad de MedicinaUniversidad de Chile, Casilla
  • Raúl Fernández-Donoso
    • Instituto de Ciencias Biomédicas, Programa de Genética Humana, Facultad de MedicinaUniversidad de Chile, Casilla
  • Juana Pincheira
    • Instituto de Ciencias Biomédicas, Programa de Genética Humana, Facultad de MedicinaUniversidad de Chile, Casilla
  • M. Soledad Berríos
    • Instituto de Ciencias Biomédicas, Programa de Genética Humana, Facultad de MedicinaUniversidad de Chile, Casilla
  • R. Eduardo Palma
    • Instituto de Ciencias Biomédicas, Programa de Genética Humana, Facultad de MedicinaUniversidad de Chile, Casilla
Article

DOI: 10.1023/A:1027374514503

Cite this article as:
Spotorno, A.E., Marin, J.C., Yévenes, M. et al. Journal of Mammalian Evolution (1997) 4: 259. doi:10.1023/A:1027374514503

Abstract

To investigate the phylogenetic relationships of living marsupials, morphometric and G-banded chromosome analyses were made in the Chilean species Dromiciops gliroides (Microbiotheria) and Thylamys elegans (Didelphimorphia). Chromosome arm lengths and patterns of G-bands were compared in at least eight bone marrow metaphase spreads in six and nine specimens, respectively. They were contrasted with those published for another 11 American and Australian genera. Three of six autosomal pairs (A1, A3, and C2) were uniquely shared by Dromiciops and some Australian species, being different in shape and G-banded patterns from those with similar total sizes in Thylamys and other South American didelphoid karyotypes. Such chromosomal correspondences suggest the past occurrence of at least three pericentric inversions. A table of character states constructed from chromosomal G-band comparisons is presented, showing that cytogenetic data agree with Szalay's (1982) hypothesis on the affinities of the South American Dromiciops with Australian marsupials.

marsupialschromosomesG-bandsC-bandsphylogenyDromiciops

Copyright information

© Plenum Publishing Corporation 1997