Table 3. Comparative table summarizing the combination of features shared by Arundelemys dardeni and Lakotemys australodakotensis, typical of either Pleurosternidae or Baenidae.

Character	Pleurosternon bullockii	Uluops uluops	Glyptops ornatus	Arundelemys dardeni	Lakotemys australodakotensis	Hayemys latifrons	Eubaena cephalica	Cedrobaena putorius
Anterior process of the pterygoid	Present	Present	–	Present	Present	Absent	Absent	Absent
Processus pterygoideus externus	Well-developed	Well-developed	Well-developed	Well-developed	Well-developed	Reduced	Reduced	Reduced
Ossified epipterygoid	Present	Present	Present	Present	Present	–	Absent	Absent
Triturating surfaces	Narrow	Narrow	Narrow	Narrow	Narrow	–	Expanded	Expanded
Exposure of prefrontal on skull roof	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Reduced	Absent
Bony contributions to articular surface of occipital condyle	–	Basioccipital	Basioccipital	Basioccipital	–	–	–	Basioccipital & exoccipitals
Palatine artery	Absent	Present	–	Absent	Present	–	Absent	Absent
Pterygoid-basioccipital contact	–	Short	Short	Elongate	Elongate	Elongate	Elongate	Elongate
Anterior tubera basioccipitalis	Present	Present	Present	Absent	Absent	Absent	Absent	Absent
Basipterygoid process	Present	Present	Present	Absent	Absent	–	Absent	Absent