Younginidae | |
---|---|
![]() | |
Life restoration ofYoungina | |
Scientific classification![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Reptilia |
Clade: | Diapsida |
Clade: | Neodiapsida |
Family: | †Younginidae Broom,1914 |
Younginidae is an extinctfamily ofdiapsid reptiles from theLate Permian. In aphylogenetic context, younginids are near the base of thecladeNeodiapsida. The only species definitively a member of the Younginidae isYoungina capensis from the Late Permian ofSouth Africa. Several genera have historically been assigned to this family, though more recentphylogenetic analyses have supported relationships with other clades.Heleosuchus griesbachi from the Late Permian of South Africa may also be a member of the family.[1]
Younginidae was traditionally assigned toEosuchia, an order containing an assemblage of basal diapsids now thought to represent anevolutionary grade rather than a true clade. In 1945paleontologistAlfred Romer reclassified Younginidae within a new group,Younginiformes, grouping it with the familiesTangasauridae andProlacertidae. Romer considered Younginidae to include many genera that are no longer classified as younginids:Paliguana,Palaegama, andSaurosternon are now considered basallepidosauromorphs,Galesphyrus andHeleosuchus are diapsids of uncertain affinities (incertae sedis),Heleophilus is now amillerettid, andHeleosaurus is now thought to be avaranopid synapsid.[2][3] Like Eosuchia, Younginiformes is no longer considered valid; for example, the phylogenetic analysis of Reisz et al. place younginids close toSauria, the clade including the still-livingarchosauromorph andlepidosauromorph reptiles, while the 'younginiform' family Tangasauridae takes a more basal position in Neodiapsida.[4] Below is acladogram from that analysis:[4]