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Microcnemus Temporal range: Early Triassic, 251–247 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauromorpha
Order:	†Protorosauria
Family:	†Protorosauridae
Genus:	†Microcnemus von Huene, 1940
Type species
†Microcnemus efremovi von Huene, 1940

Microcnemus is an extinct genus of lizard-like early archosauromorph reptiles from the Protorosauridae. Members of the genus lived during the Early Triassic period in Russia (Benthosuchus assemblage zone). Once believed to have been an ancestor to lizards, Microcnemus is now known to be one of the oldest members of the lineage that would eventually lead to archosaurs such as crocodilians and dinosaurs. The type species, M. efremovi, was named in 1940 by the German palaeontologist Friedrich von Huene.

The holotype, PIN 2252/387, consists of fifteen dorsal vertebrae, seventeen caudal vertebrae, two humeri, radius, ulna, ten femora, eleven tibiae, a fibula, ten unidentifiable bone fragments, a scapula-coracoid, a maxilla and dentary missing anterior end.

References

1. "Microcnemus efremovi Huene, 1940". www.gbif.org. Global Biodiversity Information Facility. Retrieved 2020-08-14.
2. "A new specialized prolacertilian (reptilia: Archosauromorpha) from the Lower Triassic of the Orenburg Region". ResearchGate. Retrieved 2020-08-14.
3. "Fossilworks: Microcnemus". fossilworks.org. Fossilworks. Retrieved 17 December 2021.
4. "THE CONTINENTAL TRIASSIC BIOSTRATIGRAPHY OF THE TIMAN-NORTH URALS REGION". Bureau of Ocean Energy Management. U.S.: United States Department of the Interior.
5. ^ v. Huene. 1940. Eine Reptilfauna aus der ältesten Trias Nordrußlands . Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, Beilagen-Band, Abteilung B 84:1-23
6. "Microcnemus". Paleofile. Retrieved 14 August 2020.

v t e Archosauromorpha
Kingdom: Animalia Phylum: Chordata Class: Sauropsida Clade: Diapsida Clade: Sauria Clade: Archelosauria Sauropsida see Sauropsida Archosauromorpha see below↓
Archosauromorpha Archosauromorpha †Aenigmastropheus †Czatkowiella †Elachistosuchus? †Elessaurus †Malutinisuchus †Mecistotrachelos †Prolacertoides †Protorosaurus †Rhombopholis †Vritramimosaurus †Tanysauria Jesairosaurus? Trachelosauridae Austronaga Dinocephalosaurus Fuyuansaurus? Gracilicollum? Protanystropheus Pectodens Sclerostropheus? Trachelosaurus Sharovipterygidae? Ozimek Sharovipteryx Tanystropheidae Amotosaurus Augustaburiania Cosesaurus Fuyuansaurus? Gracilicollum? Gwyneddosaurus Langobardisaurus Luxisaurus Macrocnemus Raibliania Sclerostropheus? Tanystropheus Tanytrachelos Sharovipterygidae? Crocopoda †Boreopricea †Cryptovaranoides? †Tasmaniosaurus †Teyujagua †Allokotosauria see Allokotosauria †Rhynchosauria see Rhynchosauria †Prolacertidae? Kadimakara Prolacerta Archosauriformes see below↓
Archosauriformes Archosauriformes †Antarctanax †Cuyosuchus †Eorasaurus? †Kalisuchus †Koilamasuchus †Sarmatosuchus †Syntomiprosopus †Proterosuchidae Archosaurus Chasmatosuchus? Gamosaurus Jaikosuchus Proterosuchus Samsarasuchus Tsylmosuchus? Vonhuenia? †Protopyknosia Kranosaura Triopticus †Erythrosuchidae Bharitalasuchus Chalishevia Erythrosuchus Fugusuchus? Garjainia Guchengosuchus Shansisuchus Uralosaurus Eucrocopoda †Asperoris †Dorosuchus †Heteropelta †Litorosuchus †Marcianosuchus †Polymorphodon †Vancleavea †Euparkeriidae Euparkeria Halazhaisuchus Osmolskina †Proterochampsia see Proterochampsia Crurotarsi †Phytosauria see Phytosauria Archosauria Incertae sedis †Sikannisuchus? †Smok Avemetatarsalia see Avemetatarsalia includes birds Pseudosuchia see Pseudosuchia includes crocodilians
Related topics Tooth taxa †Crosbysaurus †Lucianosaurus †Tecovasaurus †Palaeosaurus †Protecovasaurus †Uatchitodon †Zanclodon Nomina dubia †Albisaurus †Ankistrodon †Avipes †Blomosuchus †Collilongus †Exilisuchus †Fenhosuchus †Megacnemus †Microcnemus †Vjushkovisaurus †Wangisuchus Paraphyletic groups Proterosuchia Protorosauria Thecodontia Possible members Choristodera Drepanosauromorpha Kuehneosauridae Ichthyosauromorpha Sauropterygia Thalattosauria
Category

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• Archosauromorphs
• Prehistoric reptile genera
• Early Triassic reptiles of Europe
• Triassic Russia
• Extinct animals of Russia
• Fossil taxa described in 1940
• Taxa named by Friedrich von Huene
• Triassic reptile stubs