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Temporal range: Triassic, 237–210Ma
Dromomeron BW.jpg
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauromorpha
Family: Lagerpetidae
Arcucci, 1986

The Lagerpetidae (LAJ•er•pet•ih•DÆ, originally Lagerpetonidae) is a family of basal dinosauromorphs. Members of the family are known from Middle to Late Triassic (Ladinian to Norian) of Argentina, Arizona, New Mexico, and Texas.[1]


Lagerpetids are defined as being rather small (length of one hind limb being 25 centimetres (9.8 in)), with "very marked locomotor specializations", final presacral and anteriorly oriented vertebrae, a sacral including two vertebrae, a closed acetabulum, and an up facing ilium".[2] They had a short and wide pubis, and had an ischium with extensive ventral lamina.[2] In relation to the genus Lagosuchus, the genera had shorter thigh bones than shins.[2]

Classification and systematics[edit]

The lagerpetids were relatives of the dinosaurs, being a branch of the group Dinosauromorpha. They were analyzed in a phylogenetic analysis by S. J. Nesbitt in 2009.[1]