Bactrosaurus

Bactrosaurus is a genus of herbivorous hadrosauroid dinosaur that lived in Asia during the Late Cretaceous, from about 96 to 85 million years ago. The position Bactrosaurus occupies in the Cretaceous makes it one of the earliest known hadrosauroids, and although it is not known from a full skeleton, Bactrosaurus is one of the best known of these early hadrosauroids, making its discovery a significant finding.

Bactrosaurus

Gary Todd · CC0 · 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
HadrosauroideaPBDB
Diet
herbivorePBDB, for Ornithopoda
Life habit
ground dwelling, gregariousPBDB, for Ornithischia
Motility
actively mobilePBDB, for Ornithischia
Environment
terrestrialPBDB, for Ornithischia
Length
6 mWikidata

Time the record covers

At most 35 million years on record.

Every occurrence read is dated to somewhere between 100.5 Mya and 66 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Early Cretaceous — about 0 of 8 occurrencesLate Cretaceous — about 8 of 8 occurrencesLate CretaceousPaleocene — about 0 of 8 occurrences101–100 Mya — about 0.0 occurrences100–99 Mya — about 0.0 occurrences99–98 Mya — about 0.0 occurrences98–96 Mya — about 0.0 occurrences96–95 Mya — about 0.0 occurrences95–94 Mya — about 0.0 occurrences94–93 Mya — about 0.2 occurrences93–92 Mya — about 0.3 occurrences92–90 Mya — about 0.3 occurrences90–89 Mya — about 0.4 occurrences89–88 Mya — about 0.5 occurrences88–87 Mya — about 0.5 occurrences87–86 Mya — about 0.5 occurrences86–84 Mya — about 0.5 occurrences84–83 Mya — about 0.5 occurrences83–82 Mya — about 0.5 occurrences82–81 Mya — about 0.5 occurrences81–80 Mya — about 0.5 occurrences80–78 Mya — about 0.5 occurrences78–77 Mya — about 0.5 occurrences77–76 Mya — about 0.5 occurrences76–75 Mya — about 0.5 occurrences75–74 Mya — about 0.5 occurrences74–72 Mya — about 0.5 occurrences72–71 Mya — about 0.1 occurrences71–70 Mya — about 0.0 occurrences70–69 Mya — about 0.0 occurrences69–68 Mya — about 0.0 occurrences68–67 Mya — about 0.0 occurrences67–65 Mya — about 0.0 occurrences101.2 Mya65.3 Mya

8 occurrences of Bactrosaurus on record, most of them in the Late Cretaceous. 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

8 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

4 formations

Iren Dabasu — 43.83°N, 112.43°EIren Dabasu — 43.74°N, 112.18°EBaynshire — 43.50°N, 107.76°EDabrazhin — 42.76°N, 68.54°EZouyun — 40.04°N, 112.42°E

Loading coastlines…

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

Bactrosaurus and its relatives

Late Cretaceous

Where Bactrosaurus and its relatives were recorded in the Late Cretaceous.

Found in the same rock

39 taxa

The Paleobiology Database records 7 sites for Bactrosaurus, and this reads all of them. The number is how many of those sites it was catalogued from too. The 24 sharing the most are listed.

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

7 references

Each of the 8 occurrences 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 the Paleobiology Database's own record for the work.

Media and terms

Media content1

Picture of Bactrosaurus

Credit
Gary Todd
Licence
CC0
Commercial use
the licence allows it

No 3D scan of Bactrosaurus was found in Sketchfab.

Smithsonian Open Access and MorphoSource were not reached for this taxon, so this list is what the others held rather than everything there is.

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 itHadrosauroidea through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Gilmore 1933