Spondylosoma, an example aphanosaur
Clade Aphanosauria (hidden lizards) is an extinct clade of avemetatarsalian archosaurs & the sister branch to Ornithodira [which includes dinosaurs & pterosaurs, the former group containing Aves (Birds)]. Aphanosauria only contains 4 known genera, Dongusuchus, Spondylosoma, Teleocrater, & Yarasuchus, all 4 being monospecific genera.