Caseosaurus
Caseosaurus is a genus of saurischian dinosaur that lived approximately 221.5 to 212 million years ago during the latter part of the Triassic Period in what is now Texas, North America. It was a small, lightly-built, bipedal, ground-dwelling carnivore, and could grow up to 2 m (6.6 ft) long.

Matthew G. Baron and Megan E. Williams · CC BY 2.0 · via Wikidata/Commons. May be a photograph of a specimen, or an artist’s reconstruction — an interpretation of a skeleton, since colour and soft tissue are almost never preserved.
On record
Recorded, not inferred- Sits inside
- HerrerasauriaPBDB
- Motility
- actively mobilePBDB, for Osteichthyes
- Environment
- terrestrialPBDB, for Diapsida
Time the record covers
At most 32 million years on record.
Every occurrence read is dated to somewhere between 237 Mya and 205.7 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.
2 occurrences of Caseosaurus on record, most of them in the Late Triassic. Bar height is expected occurrences, not a count: each fossil is spread across the span it is dated to, so a tall narrow bar means tight dating and a low wide one means loose.
When
2 occurrences- Late Triassic100%
These are dates about fossils, not the animal: the record can only begin after it arose and end before it died out, so either end may reach further. Shares are expected occurrences: a fossil dated to a span is counted partly in each period it straddles. More on what this infers.
Found in
2 formations
- Chinle Formation1
- Tecovas Formation · Dockum Group1
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The named rock units Caseosaurus has been recovered from, largest first. Drawn where the rock is now, not where it formed.
Caseosaurus and its relatives
Late TriassicWhere Caseosaurus and its relatives were recorded in the Late Triassic.
Found in the same rock
28 taxa- Coelophysis2 sites
- Mystriosuchinae2 sites
- Stagonolepididae2 sites
- Anaschisma1 site
- Antediplodon1 site
- Archosauriformes1 site
- Chondrichthyes1 site
- Coelacanthidae1 site
- Coelophysoidea1 site
- Crocodylomorpha1 site
- Dinosauria1 site
- Dromomeron romeri1 site
- Lepidosauria1 site
- Lonchidion humblei1 site
- Machaeroprosopus buceros1 site
- Osteichthyes1 site
- Postosuchus1 site
- Redfieldiidae1 site
- Reptilia1 site
- Rioarribasuchus chamaensis1 site
- Rioarribia schrami1 site
- Semionotidae1 site
- Spinosuchus caseanus1 site
- Temnospondyli1 site
The Paleobiology Database records 2 sites for Caseosaurus, and this reads all of them. The number is how many of those sites it was catalogued from too. The 24 sharing the most are listed.
This is not a list of everything alive at the time. It is only what has come out of the same ground as this animal and been written down.
Entered from
2 references- A critical re-evaluation of the Late Triassic dinosaur taxa of North America1
- Late Triassic dinosaurs from the western United States1
Each of the 2 occurrences read was entered from one of these publications, ordered by how many each accounts for. This is not a search for papers mentioning the name. Each entry links to doi.org. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.
Media and terms
Media content1

Picture of Caseosaurus
- Source
- Wikidata/Commons
- Credit
- Matthew G. Baron and Megan E. Williams
- Licence
- CC BY 2.0
- Commercial use
- the licence allows it
No 3D scan of Caseosaurus was found in Sketchfab.
Smithsonian Open Access and MorphoSource were not reached for this taxon, so this list is what the others held rather than everything there is.
The description on this site
- Source
- Wikipedia, “Caseosaurus”
- Licence
- CC BY-SA 4.0
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itHerrerasauria through timeFormations of the Late TriassicThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Hunt et al. 1998