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Gerrhonotinae is a clade of ecologically diverse anguid lizards with a relatively rich Cenozoic fossil record. The clade was well-studied by biologists researching molecular phylogenetics of extant lizards, but there is a paucity of reliable fossil data with which to analyze the diversification and historical biogeography of the group. Although several Cenozoic lizard fossils were attributed to Gerrhonotinae, most specimens were identified on the basis of overall morphological similarity to extant taxa. Here, I use an apomorphy-based approach to identify and describe the earliest known fossil referable to the extant gerrhonotine genus Elgaria and provide a minimum divergence time between stem Elgaria and other gerrhonotines. The fossil and associated fossil material were found in the Split Rock Formation in the Granite Mountains of central Wyoming. The minimum chronostratigraphic age of Elgaria is 16.7 Ma. Additionally, the geographic range of Elgaria is extended several hundred miles from the closest extant occurrence of the genus. Simon Scarpetta. Jackson School of Geological Sciences, The University of Texas at Austin, 23 San Jacinto Boulevard and East 23rd Street, Austin, TX 78712-1722, USA. scas100@utexas.edu

palaeontologia electronica

The earliest known occurrence of Elgaria (Squamata: Anguidae) and a minimum age for crown Gerrhonotinae: Fossils from the Split Rock Formation, Wyoming, USA