Dinosaur genus

Jaxartosaurus

Riabinin 1937

Jaxartosaurus is a dinosaur genus known from bones, found in rocks 100.5–66 million years old, in China and Kazakhstan.

Confidence labels

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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

100.5–66 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: Riabinin 1937
medium
medium: Only PBDB gives this; nothing contradicts it.
Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
Described in: A. N. Riabinin (1937). O nakhodke shlemonosnykh form Dinosauria verkhnemelovykh otlozheniyakh yuzhnogo Kazakhstana [The discovery of crested forms of Upper Cretaceous dinosaurs in southern Kazakhstan]. Priroda 1937(9): 91.
medium
medium: Only PBDB gives this; its author and year match the naming authority (Riabinin 1937).
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.
Type species: Jaxartosaurus aralensis
medium
medium: Only PBDB gives this; nothing contradicts it.
Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
Lived: Coniacian to Santonian, 89.8–83.6 million years ago
medium
medium: Only PBDB gives this; nothing contradicts it.
Omnisaura calculation100.5–66 million years ago, from its dated fossil records
low
low: Omnisaura's calculation from only 2 dated record(s).
Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
Fossils found in: China
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low: Only one PBDB record.
Kazakhstan
low
low: Only one PBDB record.
Sources
Given by: Paleobiology Database. How it was chosen: Union of all sources (ISO 3166).
Rock formations: Dabrazhin
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low: Only one PBDB record.
Ulungar
low
low: Only one PBDB record.
Sources
Given by: Paleobiology Database. How it was chosen: Canonical names, automatic and editor-approved matches applied.
Family: Hadrosauridae
medium
medium: Only PBDB gives this; nothing contradicts it.
Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
Parent group: Lambeosaurinae
medium
medium: Only PBDB gives this; nothing contradicts it.
Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
Species named in its records: Jaxartosaurus aralensis
Sources
Given by: Paleobiology Database (the species its fossil records are identified as).
Diet: herbivore (inferred for its group)
medium
medium: Only PBDB gives this, and it infers it for the whole of Ornithopoda, 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 Ornithischia; 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), Wikidata (CC0 1.0)Confidence levels and gaps are Omnisaura's own assessment.

Gaps are answers

What isn't known 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: 6 facts come from a single source with nothing against them (rated medium): authority (PBDB); type species (PBDB); parent group (PBDB); family (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…?

Did Jaxartosaurus 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 Jaxartosaurus 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 1

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

Bactrosaurus

Same family: Hadrosauridae 39

Other genera in Hadrosauridae with a full profile.

Acheralichnus Acristavus Adelolophus Adynomosaurus Ahshislesaurus Ajnabia Amurosaurus Anasazisaurus Angulomastacator Aquilarhinus Aralosaurus Arenysaurus Augustynolophus Barsboldia Blasisaurus Bonapartesaurusand 23 more

Named by Riabinin 1

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

Mandschurosaurus

Found in China 68

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

Elongatoolithus Macroolithus Paraspheroolithus Dendroolithus Ovaloolithus Prismatoolithus Macroelongatoolithus Spheroolithus Nanhsiungoolithus Pinnatoolithus Protoceratops Shixingoolithus Lanceoloolithus Parafaveoloolithus Pinacosaurus Bactrosaurusand 52 more

Credits

Where this page comes from

Paleobiology DatabaseCC BY 4.0 · fossil records, ages, classification
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