Dinosaur genus

Gallimimus

Osmólska et al. 1972

Gallimimus is a dinosaur genus known from bones, found in rocks 83.6–66 million years old, in Mongolia.

Confidence labels

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How sure are we?4 high7 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 5 October 2026

83.6–66 Ma

Triassic

Jurassic

Cretaceous

252 million years ago20114366

Solid: the ages of its dated fossils, 83.6–66 million years ago (Omnisaura's calculation). Pale: the published range, 93.9–66 million years ago, which also counts records Omnisaura leaves out.

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: Osmólska et al. 1972
high
high: PBDB and Wikidata agree.
Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
Described in: H. Osmólska, E. Roniewicz, R. Barsbold (1972). A new dinosaur, Gallimimus bullatus n. gen., n. sp. (Ornithomimidae) from the Upper Cretaceous of Mongolia. Palaeontologia Polonica 27: 103–143.
high
high: PBDB gives this publication for the name; its author and year match the naming authority (Osmólska et al. 1972), on which PBDB and Wikidata agree.
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: Turonian to Maastrichtian, 93.9–66 million years ago
medium
medium: Only PBDB gives a range this precise; NHM's records give only a broader interval, which contains it.
Omnisaura calculation83.6–66 million years ago, from its dated fossil records
medium
medium: Omnisaura's calculation from 27 confirmed PBDB records.
Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
Fossils found in: Mongolia
high
high: NHM and PBDB both record it.
Sources
Given by: Paleobiology Database; Natural History Museum Data Portal. How it was chosen: Union of all sources (ISO 3166).
Rock formations: Nemegt
medium
medium: Only PBDB records it (26 records).
Baruungoyot
low
low: Only one PBDB record.
Upper Nemegt Beds
disputed
low: Only NHM gives this name and it matches no PBDB formation; awaiting an editor.
mixed
mixed: Levels differ between entries; each has its own.
Sources
Given by: Paleobiology Database; Natural History Museum Data Portal. How it was chosen: Canonical names, automatic and editor-approved matches applied.
Family: Ornithomimidae
high
high: PBDB and NHM agree.
Sources
Given by: Paleobiology Database; Natural History Museum Data Portal. How it was chosen: PBDB leads.
Parent group: Ornithomimidae
medium
medium: Only PBDB gives this; nothing contradicts it.
Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
Order: Saurischia
medium
medium: Only NHM gives this; nothing contradicts it.
Sources
Given by: Natural History Museum Data Portal. How it was chosen: Gap filled from NHM.
Named after: chicken
medium
medium: Only Wikidata gives this; nothing contradicts it.
Sources
Given by: Wikidata. How it was chosen: Wikidata leads.
Species named in its records: Gallimimus bullatus
Sources
Given by: Paleobiology Database (the species its fossil records are identified as).
Diet: herbivore, omnivore (inferred for its group)
medium
medium: Only PBDB gives this, and it infers it for the whole of Ornithomimosauria, 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, gregarious (inferred for its group)
low
low: PBDB infers this way of life for the whole of Ornithomimosauria; 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), Natural History Museum Data Portal (CC0 1.0), Wikidata (CC0 1.0)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.
Common names: no source we use gives it yet.
Held back: 3 fossil records left out: identified only tentatively (for example "cf.", "?" or the name in quotation marks).
Resting on one source: 5 facts come from a single source with nothing against them (rated medium): parent group (PBDB); order (NHM); age (headline) (PBDB); named after (Wikidata); 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

1 open

Formations

records nothing herePBDB
Upper Nemegt BedsNHM

One source names a formation the other does not. An editor hasn't ruled yet, so this is rated low until they do.

Did it meet…?

Did Gallimimus meet ?

Same time, different places. Their fossils overlap in age, 83.6 to 66 million years ago, but no rock formation holds both.

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

Same rocks, same time 40

Genera found in the same rock units, from rocks of overlapping age, the most shared fossil sites first.

Tarbosaurus Saurolophus Bagaceratops Coralloidoolithus Avimimus Macroolithus Deinocheirus Dendroolithus Elongatoolithus Faveoloolithus Protoceratops Protoceratopsidovum Mononykus Nemegtomaia Oksoko Paraspheroolithusand 24 more

Same family: Ornithomimidae 6

Other genera in Ornithomimidae with a full profile.

Aepyornithomimus Anserimimus Archaeornithomimus Dromiceiomimus Ornithomimus Struthiomimus

Named by Osmólska 5

Genera whose naming authority includes the same surname. The authority has no initials, so different people who share a surname can appear together.

Bagaceratops Bagaraatan Barsboldia Homalocephale Prenocephale

Found in Mongolia 55

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

Tarbosaurus Saurolophus Protoceratops Velociraptor Bagaceratops Pinacosaurus Protoceratopsidovum Elongatoolithus Avimimus Coralloidoolithus Macroolithus Faveoloolithus Deinocheirus Dendroolithus Mononykus Spheroolithusand 39 more

Where its fossils were found

17 fossil sites, with present-day and ancient positions

Open the map at this time

Cite this page

Omnisaura (2026). Gallimimus. Future Sailors. https://www.omnisaura.com/genera/gallimimus. Data as of 5 October 2026.

What's changed

19 Oct 2026
Age (PBDB): confidence high → medium.

Every change to Omnisaura

Use this data

Download this genus as JSON With every source and licence attached. Also recorded in: Paleobiology Database · Wikipedia (English) · GBIF · Wikidata Spotted a problem? Tell us

Pictures

4 openly licensed pictures of Gallimimus on Wikimedia Commons and museum sites, each with its own author and licence.

Gallimimus 1 NHM3.jpg
Original uploader was Firsfron at en.wikipedia, CC BY-SA 3.0
Gallimimus bullatus.002 - Natural History Museum of London (white background).JPG
Drow male, CC BY-SA 4.0
MEPAN Gallimimus bullatus model.jpg
Hiuppo, CC BY 3.0
NHM-UK_P_DF118_03_24_0311
The Trustees of the Natural History Museum, London, CC BY 4.0

Credits

Where this page comes from

Paleobiology DatabaseCC BY 4.0 · fossil records, ages, classification
Natural History Museum Data PortalCC0 1.0 · catalogued specimens
WikidataCC0 1.0 · names and identifiers
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

Pictures linked from this page are credited beside each one, with their own licences; the full list is in the JSON download.