Frontoparietals thin; anterior margins extending laterally over dorsolateral optic margin of sphenethmoid, but well behind posterior margin of nasals; in contact medially; posterolaterally in contact with epiotic eminences; not elevated posteriorly to form crest.
Prootics and exoccipitals fused; entire posterior end of skull well ossified; optic foramina ventrally marginated by cartilage; oculomotor foramina marginated anteroventraly by cartilage; prootic and jugular foramina with bony margins; with small bony knob formed below epiotic eminences above occipital condyles.
In the present paper, I intend to explore four potential synapomorphies--(1) the epiotic flange mentioned by Lynch (1996), (2) the fusion of the frontoparietal and prootic mentioned by Lynch (1971), (3) wide separation of the vomers, mentioned by Lynch (1971), and (4) a median notch of the vomer, not mentioned to date.
sisyphodemus as having short sutures evident just medial to the anterior epiotic eminence.
This character has never been mentioned although Lynch (1996) illustrated it (while illustrating a different character, the epiotic flange).