Full length paper

La información cladística de un set de datos morfológicos en lagartos del género Liolaemus (Iguania: Liolaemidae)

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Cuadernos de Herpetología 16 (2): 137-150, 2002 flobo@unsa.edu.ar

Abstract

A data set of 35 characters taken from skeletonized specimens of 24 species representing the main groups of Liolaemus described in literature were cladistically analyzed. Two different criteria were applied: we first considered all characters equally weighted and in a second step of the analysis we applied the Goloboffs implied weights method. We did six runs, one applying equally¬weighted characters criteria and five additional ones changing in each case the value for the constant K (from 2 to 6). Results were compared to those hypotheses obtained using different sources of data (DNA, alloenzymes, external morphology). Despite the reduced taxon (16% of the total number of species) and specimen sample (average of four specimens per species) and the equivocal nature of many characters (80% are polymorphic and continuos, analyzed using frequency bins and gap weighting methods), results obtained under the implied weights scheme are congruent with those published before. This study shows the efficiency of this weighting method for recovering the phylogenetic information of this set of data (not recovered applying equal-weights), and at the same time the importance of using congruence as a method for comparing results found from independent character sources.

Key words:

Liolaemus; filogenia; morfología; pesado; congruencia

Received: Sep. 03, 2002 ▪ Accepted: Nov. 15, 2002

Lobo, F. & Abdala, C. 2002. La información cladística de un set de datos morfológicos en lagartos del género Liolaemus (Iguania: Liolaemidae). Cuadernos de Herpetología 16: 137-150.