Lagerpetidae

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Lagerpetidae
Temporal range: Late Triassic, 236–211.9 Ma
Dromomeron BW.jpg
Dromomeron gregorii
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauromorpha
Family: Lagerpetidae
Arcucci, 1986
Genera

The Lagerpetidae (/ˈlɑːˌərpɛtɪˈd/; 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 generally 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] A clade of lagerpetids was also recovered in the large phylogenetic analyses of early dinosaurs and other dinosauromorphs that were produced by Baron, Norman & Barrett (2017).[4]

Cladogram simplified after Cabreira et al., 2016:[5]

Eucrocopoda

Euparkeria

Lagerpetidae

Lagerpeton

Ixalerpeton

Dromomeron

Dinosauriformes

Marasuchus

Pseudolagosuchus

Lewisuchus

Saltopus

Dinosauria

References

  1. ^ a b 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. ^ a b c 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. ^ Baron, M.G.; Norman, D.B.; Barrett, P.M. (2017). "A new hypothesis of dinosaur relationships and early dinosaur evolution". Nature. 543: 501–506. doi:10.1038/nature21700.
  5. ^ 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. 26: 3090–3095. doi:10.1016/j.cub.2016.09.040. PMID 27839975.


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