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Temporal range: Middle Triassic, 245–228 Ma
Macrocnemus bassanii 1.JPG
Fossil of Macrocnemus bassanii
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauromorpha
Order: Protorosauria
Genus: Macrocnemus
Nopcsa, 1931
  • M. basanii Nopsca, 1931 (type)
  • M. fuyuanensis Li et al., 2007

Macrocnemus is an extinct genus of archosauromorph reptile from the Middle Triassic of Europe and China.


The name is from the Greek for "long tibia". Two species have been named, the type species M. bassanii and the species M. fuyuanensis.[1] The reptile was around 20-25 cm long[citation needed]. It may have eaten limulid eggs and hunted in packs[citation needed].

Macrocnemus bassanii fossil
Life restoration of Macrocnemus basanii


  1. ^ Jiang, D.-Y.; Rieppel, O.; Fraser, N.C.; Motani, R.; Haoa, W.-C.; Tintorie, A.; Suna, Y.-L.; Suna, Z.-Y. (2011). "New information on the protorosaurian reptile Macrocnemus fuyuanensis Li et al., 2007, from the Middle/Upper Triassic of Yunnan, China". Journal of Vertebrate Paleontology. 31 (6): 1230–1237. doi:10.1080/02724634.2011.610853.