Jucaraseps, Bolet & Evans, 2012

Polyglyphanodontia and Jucaraseps

Polyglyphanodontia here includes Jucaraseps grandipes as the sister taxon to a clade containing Sineoamphisbaena hexatabularis and Cryptolacerta hassiaca . The Jucaraseps – Sineoamphisbaena – Cryptolacerta clade is united by five unambiguous synapomorphies.

1. Frontals with anterior and posterior borders of subequal width (character 57, state 0).

2. The arietal supratemporal process length is equal to less than one-half the length of the skull table part of the parietal (character 80, state 1).

3. The coronoid process is short and broad (character 192, state 0), as opposed to tall and narrow.

4. The clavicles are rodlike and lack proximal expansion and notching (character 258, state 1).

5. The prefrontal extends medially for more than one-half the breadth of the frontal (or one-quarter of the width of an azygous frontal; character 574, state 1).

Polyglyphanodontia is united by six unambiguous synapomorphies in the current analysis.

1. The posterior process of the postorbital extends for more than three-quarters of the length of the supratemporal fenestra (character 96, state 2).

2. A n e c t o p t e r y g o i d – p a l a t i n e c o n t a c t i s present anteriorly within the suborbital fenestra and the contact is broader than the smallest diameter of the suborbital fenestra (character 124, state 2).

3. Zygosphenes and zygantra are present in the dorsal vertebrae and the zygosphene articular surface faces ventrolaterally (character 235, state 2).

4. The posterior margin of the palatine is squared (character 390, state 1).

5. The parietal has a midline contact with the supraoccipital (character 565, state 1).