Biology:Lepidus praecisio

Short description: Extinct species of reptile

Lepidus praecisio Temporal range: Upper Triassic, 223 Ma PreЄ Є O S D C P T J K Pg N ↓
Holotype ankle
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	Theropoda
Genus:	†Lepidus Nesbitt & Ezcurra, 2015
Species:	†L. praecisio
Binomial name
†Lepidus praecisio Nesbitt & Ezcurra, 2015

Lepidus is a genus of extinct theropod from the Upper Triassic of the United States . It lived in the Otis Chalk localities of the Dockum Group in Texas , around 223 million years ago.

Discovery

Hypothetical restoration

It was first described in 2015 by Nesbitt & Ezcurra, who decided it warranted a new taxon, which they named Lepidus praecisio. The generic name is Latin for "fascinating", and the specific name is Latin for "fragment", or "scrap". The holotype material includes a tibia, astragalus, and fibula, and other referred material includes a femur and maxilla. The holotypic material is well preserved and shows signs of muscle scars. The astragalus and calcaneum are clearly fused into one bone, with no visible suture. The tibia resembles that of neotheropods, in overall morphology. The shape of the tibia resembles the same in Camposaurus, Coelophysis, Tawa, Eodromaeus, and Herrerasaurus.

Lepidus was one of eighteen dinosaur taxa from 2015 to be described in open access or free-to-read journals.

Classification

Partial maxilla which may have belonged to the holotype

A phylogenetic analysis was conducted, including with and without referred material. The results are shown below:

Neotheropoda	Liliensternus     Zupaysaurus     Lepidus (holotype + referred)   Coelophysoidea   Syntarsus kayentakatae       Lepidus (holotype)       Coelophysis bauri       Coelophysis rhodesiensis     Camposaurus arizonensis               Dilophosaurus     Cryolophosaurus       Tetanurae     Ceratosaurus

See also

• Timeline of coelophysoid research

References

Wikidata ☰ {{{from}}} entry