Omnisaura
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Dinosaur genus

Changmiania

Yang et al. 2020

Changmiania is a dinosaur genus known from bones, found in rocks 125.8–119.6 million years old, in China.

Confidence labels
How sure are we?0 high5 medium3 lowHow we rate confidence

Confidence labels are switched off. Facts with low confidence, or where sources disagree, still carry a small dot: tap it for the reason.

At a glance

Data as of 12 October 2026
125.8–119.6 Ma
Triassic
Jurassic
Cretaceous
252 million years ago20114366

The last non-bird dinosaurs died out 66 million years ago. That's as far from us as the end of this bar.

Named by
Yang et al. 2020
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Described in
Y. Yang, W. Wu, P.-E. Dieudonné, P. Godefroit (2020). A new basal ornithopod dinosaur from the Lower Cretaceous of China. PeerJ 8: e9832:1–44. Read it
mediummedium: Only PBDB gives this; its author and year match the naming authority (Yang et al. 2020).
Sources

Given by: Paleobiology Database. The publication the Paleobiology Database gives as the authority for this genus name, usually the one that first named and described it.

Lived
Barremian to Aptian, 125.8–119.6 million years ago
mediummedium: Only PBDB gives this; nothing contradicts it.
Omnisaura calculation125.8–119.6 million years ago, from its dated fossil records
lowlow: Omnisaura's calculation from only 1 dated record(s).
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Fossils found in
China
lowlow: Only one PBDB record.
Sources

Given by: Paleobiology Database. How it was chosen: Union of all sources (ISO 3166).

Rock formations
Yixian
lowlow: Only one PBDB record.
Sources

Given by: Paleobiology Database. How it was chosen: Canonical names, automatic and editor-approved matches applied.

Family
Thescelosauridae
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Parent group
Thescelosaurinae
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Known from
Bones
Sources

Given by: Paleobiology Database (what the name was based on).

Sources: Paleobiology Database (CC BY 4.0)Confidence levels and gaps are Omnisaura's own assessment.

Gaps are answers

What isn't known yet

  • Type species: no source we use gives it yet.
  • Order: no source we use gives it yet.
  • Common names: no source we use gives it yet.
  • What it was named after: no source we use gives it yet.
  • Resting on one source: 5 facts come from a single source with nothing against them (rated medium): name (PBDB); authority (PBDB); parent group (PBDB); family (PBDB); age (headline) (PBDB).

Size, diet and behaviour aren't covered yet. Omnisaura leaves them out rather than guess.

Where sources disagree

None open. Where our sources overlap, they agree on everything shown here.

Did it meet…?

?

No. Changmiania had gone at least 36 million years before Tyrannosaurus appears in the fossil record.

Going by the ages and rock formations of their dated fossils, as on the map. Compare their fossil sites on the map.

Lived alongside

Genera found in the same rock formations, from rocks of the same age.

PsittacosaurusSinovenatorSinornithosaurusSinosauropteryxBeipiaosaurusBolongCaudipteryxDilongLiaoceratopsSinocalliopteryxChangyuraptorDaliansaurusGrallatorIncisivosaurusJeholosaurusMei

Same family

Other genera in Thescelosauridae with a full profile.

AlbertadromeusChangchunsaurusFonaHayaJeholosaurusKoreanosaurusOrodromeusOryctodromeusParksosaurusThescelosaurusZephyrosaurus

Credits

Where this page comes from

  • Paleobiology DatabaseCC BY 4.0 · fossil records, ages, classification
  • OmnisauraOmnisaura editorial · confidence levels and gaps
  • PaleoMAP PaleoCoastlines (Kocsis and Scotese 2021)CC BY 4.0 · ancient coastlines on the small map
  • Natural EarthPublic domain · today's coastlines