Full length paper

Citogenética de los lagartos del género Liolaemus (Iguania: Liolaemidae) de América del Sur

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Cuadernos de Herpetología 18 (2): 23-36, 2005 daiassa@exa.unrc.edu.ar

Abstract

The genus Liolaemus is distributed from Peru and Bolivia mountains to the austral zone in South America. It were reviewed the karyotypes reported for the genera, 55 species which belonged to the groups chiliensis, signifer, montanus, boulengeri and wiegmanni classified by Etheridge (1995). The objective of the present work was to analyzed and compared the cytogenetic characteristics, valued the importance of the chromosomal studies to resolve the taxonomic dilemmas, to obtain cytogenetic characters for phylogenetic studies, inferences on chromosomal evolution and to propose suggestions for the cytogenetic work in the group. The diploid numbers are comprised from 2n= 28 in L. uspallatensis to 2n= 44 for L. monticola monticola, commonly constituted by 6 pairs of metacentric or submetacentric macrochromosomes and 16 to 32 microchromosomes. The meiotic analysis is firmly suggested in these species having microchoromosomes to define with certainty the diploid number.
The review of the publications shows that C Band is not informative for the genera. It has been analyzed examples to demonstrate the usefulness of the cytogenetic characterization to the diagnosis, like «darwini complex», species of the chiliensis group and cases of simpatry. It is proposed for the genera twelve cytogenetic characters for phylogenetic studies. In the boulengeri group the main chromosomal change in the evolution seems to be an increasing number of microchoromosomes throught centric fissions. The complete knowledge of each species and the relations between them is not simple and it will only be possible with the interdisciplinary work of taxonomists, genetists and systematics.

Key words:

Liolaemus; citogenética; filogenia; evolución; cariotipo

Received: May. 31, 2004 ▪ Accepted: May. 11, 2005

Associate Editor: M. Cabrera
Aiassa, D.; Martori, R. & Gorla, N. 2005. Citogenética de los lagartos del género Liolaemus (Iguania: Liolaemidae) de América del Sur. Cuadernos de Herpetología 18: 23-36.