Lagerpetidae

Lagerpetidae
Temporal range: Late Triassic, 236–211.9 Ma
Dromomeron gregorii
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauromorpha
Family: †Lagerpetidae
Arcucci, 1986
Genera

The Lagerpetidae (LAJ•er•pet•ih•DÆ, originally Lagerpetonidae) is a family of basal dinosauromorphs. Members of the family are known from Late Triassic of Argentina, Arizona, New Mexico, and Texas.[1][2]

Description

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".[3] They had a short and wide pubis, and had an ischium with extensive ventral lamina.[3] In relation to the genus Lagosuchus, the genera had shorter thigh bones than shins.[3]

Classification

The lagerpetids were relatives of the dinosaurs, being a branch of the group Dinosauromorpha. The clade was named in a phylogenetic study by S. J. Nesbitt and colleagues in 2009.[1]

Cladogram simplified after Cabreira et al., 2016:[4]

Eucrocopoda

Euparkeria
Lagerpetidae

Lagerpeton

Ixalerpeton

Dromomeron




Dinosauriformes

Marasuchus

Pseudolagosuchus

Lewisuchus

Saltopus

Dinosauria






References

  1. 1 2 The Paleobiology Database: Lagerpetonidae}
  2. ↑ Sterling J. Nesbitt; Julia Brenda Desojo; Randall B. Irmis, eds. (2013). Anatomy, Phylogeny and Palaeobiology of Early Archosaurs and Their Kin. The Geological Society of London. p. 164. Retrieved 29 March 2016.
  3. 1 2 3 Arcucci, Andrea (1986). "New materials and reinterpretation of Lagerpeton chanarensis Romer (Thecodontia, Lagerpetonidae nov.) from the Middle Triassic of La Rioja, Argentina" (PDF): 3. Retrieved 2010-04-28.
  4. ↑ Cabreira, S.F.; Kellner, A.W.A.; Dias-da-Silva, S.; da Silva, L.R.; Bronzati, M.; de Almeida Marsola, J.C.; Müller, R.T.; de Souza Bittencourt, J.; Batista, B.J.; Raugust, T.; Carrilho, R.; Brodt, A.; Langer, M.C. (2016). "A Unique Late Triassic Dinosauromorph Assemblage Reveals Dinosaur Ancestral Anatomy and Diet". Current Biology. doi:10.1016/j.cub.2016.09.040.
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