Like other archosaurs, crocodilians are diapsid, although their post-temporal fenestrae are reduced. Archosaurs are a group of diapsid amniotes and are broadly classified as reptiles. Spinoaequalis is an extinct genus of diapsid reptile. Palaeopleurosaurus is an extinct genus of diapsid reptiles belonging to the group Sphenodontia. Younginidae is an extinct family of diapsid reptiles from the Late Permian and Early Triassic. Pleurosauridae is a family of extinct marine diapsid reptiles belonging to the group Sphenodontia. Hupehsuchia is an order of diapsid reptiles closely related to ichthyosaurs. However, recent studies have recovered varanopids as taxonomically closer to diapsid reptiles. However, some recent studies have recovered them being taxonomically closer to diapsid reptiles. In any case, it is clear that drepanosaurs are diapsid reptiles. With features of both diapsid groups, the phylogenetic position of Choristodera is highly confused. "Apsisaurus" was formerly assigned as an "eosuchian" diapsid. This is a distinctly diapsid character. More analyses result in their being Neodiapsida, a derived diapsid subgroup. At first "H. scholtzi" was mistakenly classified as a diapsid.