The genus Tiliqua, along with the other Australasian skink genera Corucia and Egernia, have long been understood to form a clade called the Mabuya group, but relations within that group have been more difficult to elucidate. Among these three genera, Greer (1970) found Corucia and Egernia to be most closely related in a phylogenetic analysis of morphological data, but in a phylogenetic analysis using immunodistances, Hutchinson (1981) found instead that Tiliqua and Egernia formed a clade sister to Corucia. A more recent study using portions of the mitochondrial 12S and 16S rRNA genes found Corucia and Tiliqua to be the most closely related genera of the three (Honda et al. 1999).
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