Youngoides minor (Broom and Robinson 1948). Lower and wider than other specimens named Youngoides, RC91 appears at the base of the pseudarchosauriformes, half of the traditional archosauriformes, now divided in two.

Distinct from its phylogenetic predecessor, the UC 1528 specimen of Youngina, the skull of the RC91 specimen of Youngoides has slightly constricted rostrum in dorsal view. The jawline is straight. The orbit enters the anterior half of the skull. The postparietals are absent. The suprtemporal and postorbital do not contact and the postorbital is much shorter posteriorly. Some maxillary teeth are more than twice as deep as anteroposteriorly long. A small mandibular fenestra is present.

Most members of this clade have a low, wide skull and nares that are located far from the tip of the snout and close to the dorsal rim of the rostrum. RC91 does not preserve this the nares.

See the complete reptile tree.

The Choristodera, their predecessors (above) and sisters (below) not to scale.

Broom R and Robinson JT 1948. Some new fossil reptiles from the Karroo beds of South Africa: Proceedings of the Zoological Society of London, series B, v. 118, p. 392-407.

wiki/Youngina