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Temporal range:
Lower Triassicpresent
250 mya – 0
Protome batalaria.jpg
Life restoration of Protome batalaria
Ornithosuchus BW.jpg
Life restoration of Ornithosuchus woodwardi
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
(unranked): Archosauria
(unranked): Crurotarsi

The Crurotarsi are one of the two main groups of archosaurs. It includes the archosaurs (living today are crocodiles and birds). It also includes all their ancestors and relatives right back to the early Triassic period, including the Pseudosuchia.


Both main groups of Archosaurs are defined by features of their ankle joints.[1][2]

References[change | change source]

  1. Sereno P.C. & Arcucci A.B. 1990. The monophyly of crurotarsal archosaurs and the origin of bird and crocodile ankle joints. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 180: 21–52.
  2. Nesbitt S.J. 2011. The early evolution of archosaurs: relationships and the origin of major clades. Bulletin of the American Museum of Natural History 352: 1–292. [1]