Uragasaurus kalasinensis

Uragasaurus is an extinct genus of mamenchisaurid sauropod dinosaur known from the Late Jurassic Phu Kradung Formation of Thailand. The genus contains a single species, Uragasaurus kalasinensis, known from a single dorsal (trunk) vertebra. It is the first member of the family Mamenchisauridae named from Thailand.

Uragasaurus kalasinensis

A. Nilpanapan S. Manitkoon, V. Suteethorn & K. Lauprasert · CC BY 4.0 · via Wikipedia/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
UragasaurusPBDB
Diet
herbivorePBDB, for Sauropoda
Life habit
ground dwelling, gregariousPBDB, for Sauropoda
Motility
actively mobilePBDB, for Sauropoda
Environment
terrestrialPBDB, for Sauropoda

Time the record covers

At most 13 million years on record.

The one occurrence read is dated to somewhere between 149.2 Mya and 137.05 Mya, which is a dating window rather than a span.

Late Jurassic — about 1 of 1 occurrenceLate JurassicEarly Cretaceous — about 1 of 1 occurrenceEarly Cretaceous149–149 Mya — about 0.0 occurrences149–148 Mya — about 0.0 occurrences148–148 Mya — about 0.0 occurrences148–148 Mya — about 0.0 occurrences148–147 Mya — about 0.0 occurrences147–147 Mya — about 0.0 occurrences147–146 Mya — about 0.0 occurrences146–146 Mya — about 0.0 occurrences146–145 Mya — about 0.0 occurrences145–145 Mya — about 0.0 occurrences145–144 Mya — about 0.0 occurrences144–144 Mya — about 0.0 occurrences144–144 Mya — about 0.0 occurrences144–143 Mya — about 0.0 occurrences143–143 Mya — about 0.0 occurrences143–142 Mya — about 0.0 occurrences142–142 Mya — about 0.0 occurrences142–141 Mya — about 0.0 occurrences141–141 Mya — about 0.0 occurrences141–140 Mya — about 0.0 occurrences140–140 Mya — about 0.0 occurrences140–140 Mya — about 0.0 occurrences140–139 Mya — about 0.0 occurrences139–139 Mya — about 0.0 occurrences139–138 Mya — about 0.0 occurrences138–138 Mya — about 0.0 occurrences138–137 Mya — about 0.0 occurrences137–137 Mya — about 0.0 occurrences149.7 Mya136.6 Mya

1 occurrence of Uragasaurus kalasinensis on record, most of them in the Late Jurassic. 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

1 occurrences

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

1 formation

Phu Kradung — 16.65°N, 102.25°E

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The named rock units Uragasaurus kalasinensis has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Uragasaurus kalasinensis and its relatives

Late Jurassic

Where Uragasaurus kalasinensis and its relatives were recorded in the Late Jurassic.

Found in the same rock

13 taxa

The Paleobiology Database records 1 site for Uragasaurus kalasinensis, and this reads all of them. The number is how many of those sites it was catalogued from too.

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

1 reference

Each of the 1 occurrence 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 Uragasaurus kalasinensis

Credit
A. Nilpanapan S. Manitkoon, V. Suteethorn & K. Lauprasert
Licence
CC BY 4.0
Commercial use
the licence allows it

No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.

The description on this site

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 itUragasaurus through timeFormations of the Late JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Nilpanapan et al. 2026