Mosasauria

Mosasauria is a clade of aquatic and semiaquatic squamates that lived during the Cretaceous period. Fossils belonging to the group have been found in all continents around the world. Early mosasaurians like dolichosaurs were small long-bodied lizards that inhabited nearshore coastal and freshwater environments; the Late Cretaceous saw the rise of large marine forms, the mosasaurids, which are the clade's best-known members.

Mosasauria

Kornhuber, 1901 · Public Domain · 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
ToxicoferaPBDB
Motility
actively mobilePBDB, for Osteichthyes
Environment
terrestrialPBDB, for Amniota

Time the record covers

At most 18 million years on record.

Every occurrence read is dated to somewhere between 83.6 Mya and 66 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Late Cretaceous — about 4 of 4 occurrencesLate CretaceousPaleocene — about 0 of 4 occurrences84–83 Mya — about 0.0 occurrences83–83 Mya — about 0.2 occurrences83–82 Mya — about 0.2 occurrences82–82 Mya — about 0.2 occurrences82–81 Mya — about 0.2 occurrences81–80 Mya — about 0.2 occurrences80–80 Mya — about 0.2 occurrences80–79 Mya — about 0.2 occurrences79–79 Mya — about 0.2 occurrences79–78 Mya — about 0.2 occurrences78–77 Mya — about 0.2 occurrences77–77 Mya — about 0.2 occurrences77–76 Mya — about 0.2 occurrences76–75 Mya — about 0.2 occurrences75–75 Mya — about 0.2 occurrences75–74 Mya — about 0.2 occurrences74–74 Mya — about 0.2 occurrences74–73 Mya — about 0.2 occurrences73–72 Mya — about 0.2 occurrences72–72 Mya — about 0.1 occurrences72–71 Mya — about 0.1 occurrences71–70 Mya — about 0.1 occurrences70–70 Mya — about 0.1 occurrences70–69 Mya — about 0.1 occurrences69–69 Mya — about 0.1 occurrences69–68 Mya — about 0.1 occurrences68–67 Mya — about 0.1 occurrences67–67 Mya — about 0.1 occurrences67–66 Mya — about 0.1 occurrences66–66 Mya — about 0.0 occurrences84.1 Mya65.5 Mya

4 occurrences of Mosasauria 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

4 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

Kanguk — 79.75°N, 85.60°WEl Molino — 19.01°S, 65.23°WDinosaur Park — 50.78°N, 111.36°WDemopolis — 34.58°N, 88.63°W

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

Mosasauria and its relatives

Late Cretaceous

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

Found in the same rock

104 taxa

The Paleobiology Database records 4 sites for Mosasauria, 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

4 references

Each of the 4 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. Entries link to doi.org where the Paleobiology Database holds an identifier, and to its own record where it does not. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content1

Picture of Mosasauria

Credit
Kornhuber, 1901
Licence
Public Domain
Commercial use
the licence allows it

No 3D scan of Mosasauria was found in MorphoSource and Sketchfab.

Smithsonian Open Access was 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 itToxicofera through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.