Name: Lepidus praecisio
Meaning: Together, the dinosaur’s genus and species names translate to “fascinating scrap”.
Age: Late Triassic, more than 223 million years ago.
Where in the world?: Near Big Spring, in northern Texas.
What sort of critter?: Lepidus was a theropod dinosaur, relatively closely-related to the well-known Coelophysis.
Size: Unknown, but comparable to other small theropods of the Late Triassic.
How much of the creature’s body is known?: An ankle joint, as well as a femur and a jaw bone that may have belonged to the same dinosaur.
Claim to fame: The Late Triassic of North America was not very hospitable to dinosaurs. These dinosaurs were small, rare, and – so far as has been discovered – only represented the theropod branch of the dinosaur family tree. Still, as Sterling Nesbitt and Martín Ezcurra write in their description of Lepidus, a closer look at previously-known and unpublished fossils is yielding a few new dinosaurs from this slice of Mesozoic time.
Lepidus is one such dinosaur. The bones that represent the creature were discovered by a Works Progress Administration paleontology team in 1941 as part of a collection of fragments and isolated bones that have mostly gone unstudied until now.
Relatively little of Lepidus has been found. But, compared to other dinosaur fossils that are little more than a piece of limb bone, it’s one of the best specimens to come out from its particular place and time. Dinosaurs are rarely found in this part of the Triassic in Texas, and Lepidus establishes that a particular subset of the “beast footed” dinosaurs – the neotheropods – were present in the Triassic tropics of North America before 223 million years ago. They were part of a meek dinosaurian community that mixed the archaic and the novel – older forms that more closely resembled some of the earliest dinosaurs as well as derived animals that better fit the sleek and slender profile of celebrity species such as Coelophysis. These latter lineages would help launch the true Age of Dinosaurs after the end-Triassic mass extinction turned fate in their favor.
Reference:
Nesbitt, S., Ezcurra, M. 2015. The early fossil record of dinosaurs in North America: A new neotheropod from the base of the Upper Triassic Dockum Group of Texas. Acta Palaeontologica Polonica. doi: 10.4202/app.00143.2014
Previous Paleo Profiles:
Atychodracon megacephalus
Sefapanosaurus zastronensis
Huanansaurus ganzhouensis
Zhenyuanlong suni
Related Topics
Go Further
Animals
- Soy, skim … spider. Are any of these technically milk?Soy, skim … spider. Are any of these technically milk?
- This pristine piece of the Amazon shows nature’s resilienceThis pristine piece of the Amazon shows nature’s resilience
- Octopuses have a lot of secrets. Can you guess 8 of them?
- Animals
- Feature
Octopuses have a lot of secrets. Can you guess 8 of them? - This biologist and her rescue dog help protect bears in the AndesThis biologist and her rescue dog help protect bears in the Andes
Environment
- This pristine piece of the Amazon shows nature’s resilienceThis pristine piece of the Amazon shows nature’s resilience
- Listen to 30 years of climate change transformed into haunting musicListen to 30 years of climate change transformed into haunting music
- This ancient society tried to stop El Niño—with child sacrificeThis ancient society tried to stop El Niño—with child sacrifice
- U.S. plans to clean its drinking water. What does that mean?U.S. plans to clean its drinking water. What does that mean?
History & Culture
- Gambling is everywhere now. When is that a problem?Gambling is everywhere now. When is that a problem?
- Beauty is pain—at least it was in 17th-century SpainBeauty is pain—at least it was in 17th-century Spain
- The real spies who inspired ‘The Ministry of Ungentlemanly Warfare’The real spies who inspired ‘The Ministry of Ungentlemanly Warfare’
- Heard of Zoroastrianism? The religion still has fervent followersHeard of Zoroastrianism? The religion still has fervent followers
- Strange clues in a Maya temple reveal a fiery political dramaStrange clues in a Maya temple reveal a fiery political drama
Science
- Soy, skim … spider. Are any of these technically milk?Soy, skim … spider. Are any of these technically milk?
- Can aspirin help protect against colorectal cancers?Can aspirin help protect against colorectal cancers?
- The unexpected health benefits of Ozempic and MounjaroThe unexpected health benefits of Ozempic and Mounjaro
- Do you have an inner monologue? Here’s what it reveals about you.Do you have an inner monologue? Here’s what it reveals about you.
- Jupiter’s volcanic moon Io has been erupting for billions of yearsJupiter’s volcanic moon Io has been erupting for billions of years
Travel
- Follow in the footsteps of Robin Hood in Sherwood ForestFollow in the footsteps of Robin Hood in Sherwood Forest
- This chef is taking Indian cuisine in a bold new directionThis chef is taking Indian cuisine in a bold new direction
- On the path of Latin America's greatest wildlife migrationOn the path of Latin America's greatest wildlife migration
- Everything you need to know about Everglades National ParkEverything you need to know about Everglades National Park