Stereognathus

Stereognathus is an extinct genus of tritylodontid cynodonts from the Middle Jurassic of the United Kingdom. There is a single named species: S. ooliticus, named after the Great Oolite deposits of England. A second species, S. hebridicus, was named after the Hebrides in Scotland, where it was found; it was synonymized with S. ooliticus in 2017.

Stereognathus

Sir Richard Owen (Life time: 1804-1892) · 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
TritylodontidaePBDB
Motility
actively mobilePBDB, for Osteichthyes
Environment
terrestrialPBDB, for Amniota

Time the record covers

At least 43 million years on record.

The record covers at least 165.3 Mya to 121.4 Mya. No occurrence read is dated outside 168.2 Mya to 113.2 Mya.

Middle Jurassic — about 11 of 15 occurrencesMiddle JurassicLate Jurassic — about 0 of 15 occurrencesEarly Cretaceous — about 4 of 15 occurrencesEarly Cretaceous169–167 Mya — about 3 occurrences167–165 Mya — about 7 occurrences165–164 Mya — about 0.7 occurrences145–143 Mya — about 0.0 occurrences143–141 Mya — about 0.1 occurrences141–139 Mya — about 0.1 occurrences139–137 Mya — about 0.1 occurrences137–135 Mya — about 0.1 occurrences135–133 Mya — about 0.1 occurrences133–131 Mya — about 0.1 occurrences131–129 Mya — about 0.1 occurrences129–127 Mya — about 0.1 occurrences127–125 Mya — about 0.1 occurrences125–124 Mya — about 0.4 occurrences124–122 Mya — about 0.4 occurrences122–120 Mya — about 0.5 occurrences120–118 Mya — about 0.5 occurrences118–116 Mya — about 0.5 occurrences116–114 Mya — about 0.5 occurrences114–112 Mya — about 0.2 occurrences165.3 Mya121.4 Mya169 Mya112 Mya

15 occurrences of Stereognathus on record, most of them in the Middle 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

15 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

9 formations

Forest Marble — 51.87°N, 1.27°WForest Marble — 50.71°N, 2.78°WForest Marble — 50.68°N, 2.66°WForest Marble — 51.73°N, 1.98°WForest Marble — 51.51°N, 2.16°WIlek — 55.90°N, 87.96°EIlek — 56.53°N, 91.81°EIlek — 55.97°N, 88.09°EChipping Norton Limestone — 51.99°N, 1.80°WItat — 55.65°N, 89.18°EHampen Marly — 51.80°N, 1.23°WTaynton Limestone — 51.85°N, 1.43°WBatylykh — 62.73°N, 117.61°EKilmaluag — 57.17°N, 6.11°WWhite Limestone — 51.75°N, 1.17°W

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

Stereognathus and its relatives

Middle Jurassic

Where Stereognathus and its relatives were recorded in the Middle Jurassic.

Found in the same rock

260 taxa

The Paleobiology Database records 15 sites for Stereognathus, 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

11 references

Each of the 15 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 Stereognathus

Credit
Sir Richard Owen (Life time: 1804-1892)
Licence
Public Domain
Commercial use
the licence allows it

No 3D scan of Stereognathus 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 itTritylodontidae through timeFormations of the Middle JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Charlesworth 1854