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''Lepidus'' is a genus of
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
A phylogenetic analysis was conducted, including with and without referred material. The results are shown below:
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
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
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 Specific name may refer to:
* in Database management systems, a system-assigned name that is unique within a particular database
In taxonomy, either of these two meanings, each with its own set of rules:
* Specific name (botany), the two-part (bino ...
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
In humans and many other primates, the calcaneus (; from the Latin ''calcaneus'' or ''calcaneum'', meaning heel) or heel bone is a bone of the tarsus of the foot which constitutes the heel. In some other animals, it is the point of the hock.
St ...
are clearly fused into one bone, with no visible suture. The tibia resembles that of neotheropods
Neotheropoda (meaning "new theropods") is a clade that includes coelophysoids and more advanced theropod dinosaurs, and is the only group of theropods that survived the Triassic–Jurassic extinction event. All neotheropods became extinct by the e ...
, in overall morphology. The shape of the tibia resembles the same in '' Camposaurus'', '' Coelophysis'', '' Tawa'', '' Eodromaeus'', and ''Herrerasaurus
''Herrerasaurus'' is a genus of saurischian dinosaur from the Late Triassic period. This genus was one of the earliest dinosaurs from the fossil record. Its name means "Herrera's lizard", after the rancher who discovered the first specimen in ...
''.
''Lepidus'' was one of eighteen dinosaur taxa from 2015 to be described in open access or free-to-read journals.
Classification
A phylogenetic analysis was conducted, including with and without referred material. The results are shown below:
See also
*Timeline of coelophysoid research
This timeline of coelophysoid research is a chronological listing of events in the History of paleontology, history of paleontology focused on the coelophysoids, a group of primitive theropod dinosaurs that were among Earth's dominant predators d ...
References
Late Triassic dinosaurs of North America Coelophysoids Fossil taxa described in 2015 Taxa named by Sterling Nesbitt Paleontology in Texas {{theropod-stub