Euposaurus cirinensis ( Lortet 1892, MHNL 15681, Late Jurassic, Kimmeridgian, 155 mya, 3.5cm snout vent length) nests as a basal Iguania (Cocude-Michel 1963) derived from a sister to Liushusaurus and Calanguban. Evans (1994) assigned it to Squamata incerta sedis. The large skull and large orbit might seem to be juvenile traits, but sister taxa share these traits. Euposaurus was a sister to Iguana.

Euposaurus is tiny with a relatively larger skull with a robust palate.

Cocude-Michel M 1963. Les rhynchocephaJes et les sauriens de calcaires
lithographiques (Jurassique supérieur) d'Europe occidentale. Nouvelles Archives
du Muséum d'Histoire Naturelle de Lyon 7: 1-187.

Evans SE 1994. A re-evaluation of the Late Jurassic (Kimmeridgian) reptile Euposaurus (Reptilia: Lepidosauria) from Cerin, France. Geobios 27(5):621-631.

Lortet M 1892. Les reptiles fossiles du Bassin du Rhone. Archives du Musee de
Histoire Naturelle, Lyon 5: 1-139.