Chroniosaurus

Chroniosaurus is an extinct genus of chroniosuchid stegocephalian, often considered a reptiliomorph but possibly a stem-tetrapod, from upper Permian deposits of Novgorod, Orenburg and Vologda Regions, Russia. It was first named by Tverdokhlebova in 1972 and the type species is Chroniosaurus dongusensis.

Chroniosaurus

DiBgd · CC BY-SA 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
ChroniosuchidaePBDB
Motility
actively mobilePBDB, for Osteichthyes
Environment
brackish,freshwater,terrestrialPBDB, for Tetrapoda

Time the record covers

At most 11 million years on record.

Every occurrence read is dated to somewhere between 264.28 Mya and 254.14 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Permian — about 13 of 13 occurrencesPermian264–264 Mya — about 0.5 occurrences264–264 Mya — about 0.8 occurrences264–263 Mya — about 0.8 occurrences263–263 Mya — about 0.8 occurrences263–263 Mya — about 0.8 occurrences263–262 Mya — about 0.8 occurrences262–262 Mya — about 0.8 occurrences262–261 Mya — about 0.8 occurrences261–261 Mya — about 0.8 occurrences261–261 Mya — about 0.8 occurrences261–260 Mya — about 0.8 occurrences260–260 Mya — about 0.8 occurrences260–260 Mya — about 0.4 occurrences260–259 Mya — about 0.3 occurrences259–259 Mya — about 0.3 occurrences259–258 Mya — about 0.3 occurrences258–258 Mya — about 0.3 occurrences258–258 Mya — about 0.3 occurrences258–257 Mya — about 0.3 occurrences257–257 Mya — about 0.3 occurrences257–257 Mya — about 0.2 occurrences257–256 Mya — about 0.1 occurrences256–256 Mya — about 0.1 occurrences256–255 Mya — about 0.1 occurrences255–255 Mya — about 0.1 occurrences255–255 Mya — about 0.1 occurrences255–254 Mya — about 0.1 occurrences254–254 Mya — about 0.1 occurrences264.8 Mya253.6 Mya

13 occurrences of Chroniosaurus on record, most of them in the Permian. 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

13 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

Poldarsa — 60.53°N, 44.91°EPoldarsa — 60.37°N, 44.08°EPoldarsa — 60.58°N, 45.43°EPoldarsa — 60.59°N, 45.53°EPoldarsa — 60.61°N, 45.62°EMalokinelskaya — 51.47°N, 55.14°EMalokinelskaya — 53.47°N, 52.14°EIlyinskoe — 55.02°N, 48.83°EKama Region Fifth — 55.02°N, 48.87°E

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The named rock units Chroniosaurus has been recovered from, largest first. Drawn where the rock is now, not where it formed. 3 occurrences have no formation on record, which is common for older literature.

Chroniosaurus and its relatives

Permian

Where Chroniosaurus and its relatives were recorded in the Permian.

Found in the same rock

195 taxa

The Paleobiology Database records 13 sites for Chroniosaurus, 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 13 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 Chroniosaurus

Credit
DiBgd
Licence
CC BY-SA 4.0
Commercial use
the licence allows it

No 3D scan of Chroniosaurus 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 itChroniosuchidae through timeFormations of the PermianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Tverdokhlebova 1972