Omnisaura

Dinosaur genus

Aratasaurus

Sayão et al. 2020

Aratasaurus is a dinosaur genus known from bones, found in rocks 113.2–110.1 million years old, in Brazil.

Confidence labels
How sure are we?0 high5 medium4 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 11 October 2026
113.2–110.1 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
Sayão et al. 2020
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

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

Described in
J. M. Sayão, A. A. F. Saraiva, A. S. Brum, R. A. M. Bantim, R. C. L. Pedroso de Andrade, X. Cheng, F. Jorge de Lima, H. de Paula Silva, A. W. A. Kellner (2020). The first theropod dinosaur (Coelurosauria, Theropoda) from the base of the Romualdo Formation (Albian), Araripe Basin, Northeast Brazil. Scientific Reports 10(10892). Read it
mediummedium: Only PBDB gives this; its author and year match the naming authority (Sayão 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
Albian, 113.2–110.1 million years ago
mediummedium: Only PBDB gives this; nothing contradicts it.
Omnisaura calculation113.2–110.1 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
Brazil
lowlow: Only one PBDB record.
Sources

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

Rock formations
Romualdo
lowlow: Only one PBDB record.
Sources

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

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

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

Species named in its records
Aratasaurus museunacionali
Sources

Given by: Paleobiology Database (the species its fossil records are identified as).

Diet
carnivore (inferred for its group)
mediummedium: Only PBDB gives this, and it infers it for the whole of Coelurosauria, the group this genus belongs to, not from this genus's own fossils.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB, inferred from a group the genus belongs to.

Way of life
ground dwelling, solitary (inferred for its group)
lowlow: PBDB infers this way of life for the whole of Theropoda; behaviour is rarely known for one genus.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB, inferred from a group the genus belongs to.

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.
  • Family: 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); age (headline) (PBDB); diet (PBDB).

Size and appearance aren't covered yet, and diet and way of life only as PBDB infers them for the wider group. Omnisaura leaves the rest out rather than guess.

Where sources disagree

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

Did it meet…?

?

No. Aratasaurus had gone at least 26.5 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.

Connections

Genera linked to Aratasaurus by where and when their fossils were found, by classification and by who named them. Select a name to open its page.

AratasaurusSame parent groupAlso found in BrazilBicentenariaBressanichnusCoelurusCridotrisauropusand 6 moreAmazonsaurusBerthasauraCarcharodontosaurus

Found in Brazil 3

Other genera found in Brazil, from rocks of overlapping age, the most fossil sites there first.

AmazonsaurusBerthasauraCarcharodontosaurus

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