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.

Colobops noviportensis (Sues and Baird 1993; Pritchard et al. 2018; Scheyer et al. 2020) was described as a tiny (2.5 cm long skull) saurian reptile from the Triassic of Connecticut, USA. Unfortunately, their phylogenetic analysis did not include the basal sphenodontid, Marmoretta, more similar to each other in the large reptile tree (LRT, 1085 taxa) than any other tested taxon. They are also the same size. Note the postorbital process invading the large upper temporal fenestra. No teeth are preserved.

Scheyer et al. nested Colobops with the rhynchocephalian, Sphenodon, once again omitting Marmoretta from their analysis.

Evans SE 1991. A new lizard−like reptile (Diapsida: Lepidosauromorpha) from the Middle Jurassic of Oxfordshire. Zoological Journal of the Linnean Society 103:391-412.

Pritchard AC, Gauthier JA, Hanson M, Bever GS and Bhullar B-AS 2018. A tiny Triassic saurian from Connecticut and the early evolution of the diapsid feeding apparatus. Nature Communications open access DOI: 10.1038/s41467-018-03508-1

Scheyer TM, Spiekman SNF, Sues H-D, Ezcurra MD, Butler RJ and Jones MEH 2020. Colobops: a juvenile rhynchocephalian reptile (Lepidosauromorpha), not a diminutive archosauromorph with an unusually strong bite. Royal Society Open Science 7:192179.
http://dx.doi.org/10.1098/rsos.192179

Sues H-D and Baird D 1993. A Skull of a Sphenodontian Lepidosaur from the New Haven Arkose (Upper Triassic: Norian) of Connecticut. Journal of Vertebrate Paleontology. 13 (3): 370–372.

Waldman M and Evans SE 1994. Lepidosauromorph reptiles from the Middle Jurassic of Skye. Zoological Journal of the Linnean Society 112:135-150.

wiki/Marmoretta
wiki/Colobops