Children (22 direct children, 41 direct and indirect children):
Tuatara
(tree size 4)
Sphenodon
Oenosaurus
(tree size 1)
Clevosaurus
(tree size 1)
Brachyrhinodon
Planocephalosaurus
(tree size 1)
Sapheosaurus
Godavarisaurus
Leptosaurus
Rebbanosaurus
Sigmala
Sphenodontinae
(tree size 3)
Zapatadon
Sphenovipera
Kawasphenodon
Sphenotitan
Ankylosphenodon
(tree size 1)
Derasmosaurus
(tree size 1)
Priosphenodon
(tree size 1)
Hatteria
(tree size 1)
Opisthodontia
(tree size 4)
Kallimodon
Homoeosaurus
(tree size 1)