Marmoretta oxoniensis (Evans 1991, Waldman and Evans 1994) Middle/Late Jurassic, ~2.5 cm skull length, orginally considered a sister of kuehneosaurs, drepanosaurs and lepidosaurs. Here Marmoretta was derived from a sister to Megachirella and Palaegama. Marmoretta was basal to Gephyrosaurus and the rest of the Rhynchochephalia. Two specimens are known with distinct proportions in the skull roof (frontal and parietal, see above).
Distinct from Megachirella, the skull of Marmoretta had a larger orbit. The parietals were longer. The prefrontal was narrower. The jugal was reduced with a large orbit/maxilla contact. The palatine was enlarged. The basisphenoid and basiocciput were smaller.