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Trachelosaurus; Temporal range: Early Triassic, 247–242 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
	Holotype specimen
	Reconstructed skeleton of the holotype
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauromorpha
Family:	†Trachelosauridae
Genus:	†Trachelosaurus; Broili & Fischer, 1917
Species:	†T. fischeri
Binomial name
	†Trachelosaurus fischeri; Broili & Fischer, 1917

Trachelosaurus is an extinct genus of lizard-like early archosauromorph reptiles in the family Trachelosauridae.^[1] It was originally described as a dinosaur^[2] until it was redescribed as a "protorosaur" reptile by Robert L. Carroll in 1988.^[3] The type species, T. fischeri, was described by F. Broili & E. Fischer in 1917^[2] based on remains found in the Solling Formation (Buntsandstein), Bernburg, Germany.^[4] A 2024 redescription identified Trachelosaurus as a long-necked and presumably aquatic reptile closely related to Dinocephalosaurus from the Guanling Formation of China.^[5]

Classification

In their 2024 redescription of Trachelosaurus, Spiekman and colleagues recovered it in a clade with the Chinese Dinocephalosaurus in a clade previously named Dinocephalosauridae in 2021. However, the principle of priority instructs that the name Trachelosauridae, which was first erected as a monotypic clade for Trachelosaurus, should be used instead. The results of their phylogenetic analyses are shown in the cladogram below:^[5]

Tanysauria

Jesairosaurus

Trachelosauridae

	Austronaga

	Pectodens

Fuyuansaurus

Trachelosaurus

	Gracilicollum

	Dinocephalosaurus

Tanystropheidae

Augustaburiania

Luxisaurus

Macrocnemus bassanii

	Macrocnemus fuyuanensis

	Macrocnemus obristi

UFRGS-PV-492-T

Amotosaurus

Langobardisaurus

	Raibliania

	Tanystropheus spp.

Sclerostropheus

	Ozimek

	Tanytrachelos

References

^ O. Kuhn. (1971). Reptiles of the German Triassic. 1-105
^ ^a ^b F. Broili and E. Fischer. (1917). Trachelosaurus fischeri nov. gen. nov. sp. A new dinosaur from the Buntsandstein of Bernburg. Jahrbuch der Königlich Preussischen geologischen Landesanstalt zu Berlin 37(1):359-414
^ R. L. Carroll. (1988). Vertebrate Paleontology and Evolution 1-698
^ H. H. Ecke. (1986). Palynologie des Zechsteins und Unteren Buntsandsteins im Germanischen Becken. Dissertation Georg-August-Universität Göttingen 1-117
^ ^a ^b Spiekman, Stephan N. F.; Ezcurra, Martín D.; Rytel, Adam; Wang, Wei; Mujal, Eudald; Buchwitz, Michael; Schoch, Rainer R. (2024-03-15). "A redescription of Trachelosaurus fischeri from the Buntsandstein (Middle Triassic) of Bernburg, Germany: the first European Dinocephalosaurus-like marine reptile and its systematic implications for long-necked early archosauromorphs". Swiss Journal of Palaeontology. 143 (1): 10. doi:10.1186/s13358-024-00309-6. ISSN 1664-2384.