Seymouriamorpha

Seymouriamorpha are an extinct group of tetrapods known from the Carboniferous and Permian periods. They have long been considered stem-amniotes (reptiliomorphs), and most paleontologists still accept this point of view, but some analyses suggest that seymouriamorphs are stem-tetrapods. Seymouriamorphs are divided into three main groups: Kotlassiidae, Discosauriscidae, and Seymouriidae, which includes the best-known genus, Seymouria. The last seymouriamorphs became extinct by the end of the Permian.

Seymouriamorpha

Ryan Somma · CC BY-SA 2.0 · 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
AmphibiosauriaPBDB
Motility
actively mobilePBDB, for Osteichthyes
Environment
brackish,freshwater,terrestrialPBDB, for Tetrapoda

Time the record covers

At least 47 million years on record.

The record covers at least 307 Mya to 259.857 Mya. No occurrence read is dated outside 315.2 Mya to 251.902 Mya.

Carboniferous — about 1 of 104 occurrencesCarboniferousPermian — about 103 of 104 occurrencesPermianEarly Triassic — about 0 of 104 occurrences316–314 Mya — about 0.1 occurrences314–312 Mya — about 0.3 occurrences312–310 Mya — about 0.3 occurrences310–308 Mya — about 0.3 occurrences308–305 Mya — about 0.1 occurrences299–297 Mya — about 3 occurrences297–295 Mya — about 4 occurrences295–292 Mya — about 3 occurrences292–290 Mya — about 3 occurrences290–288 Mya — about 3 occurrences288–286 Mya — about 3 occurrences286–284 Mya — about 3 occurrences284–281 Mya — about 4 occurrences281–279 Mya — about 4 occurrences279–277 Mya — about 4 occurrences277–275 Mya — about 5 occurrences275–273 Mya — about 2 occurrences273–270 Mya — about 2 occurrences270–268 Mya — about 2 occurrences268–266 Mya — about 3 occurrences266–264 Mya — about 7 occurrences264–262 Mya — about 15 occurrences262–259 Mya — about 15 occurrences259–257 Mya — about 13 occurrences257–255 Mya — about 3 occurrences255–253 Mya — about 0.6 occurrences253–251 Mya — about 0.1 occurrences307 Mya259.857 Mya316 Mya251 Mya

104 occurrences of Seymouriamorpha 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

104 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

35 formations

Arroyo — 33.80°N, 99.24°WArroyo — 33.76°N, 99.14°WArroyo — 33.70°N, 99.27°WArroyo — 33.59°N, 99.26°WPoldarsa — 60.53°N, 44.91°EPoldarsa — 60.37°N, 44.08°EPoldarsa — 60.58°N, 45.43°EPoldarsa — 60.61°N, 45.62°EVale — 33.73°N, 99.56°WVale — 32.13°N, 99.75°WVale — 32.23°N, 99.83°WKutulukskaya — 53.29°N, 53.01°EKutulukskaya — 51.68°N, 54.22°EKutulukskaya — 52.78°N, 53.16°EMalokinelskaya — 51.47°N, 55.14°EMalokinelskaya — 53.47°N, 52.14°EMiddle Letovice — 49.57°N, 16.61°ESalarevo — 61.19°N, 46.63°ESalarevo — 59.96°N, 43.11°EIsheevo — 55.78°N, 48.93°EIsheevo — 55.04°N, 46.78°EPechishchi — 58.64°N, 49.85°EKutuluk — 51.34°N, 55.76°EKutuluk — 52.07°N, 54.23°EKama Region Third — 55.03°N, 48.88°EBacov — 49.39°N, 16.55°EBroumov — 50.79°N, 15.07°EOrgan Rock Shale — 37.05°N, 110.07°WWellington — 36.16°N, 97.34°WTambach — 50.81°N, 10.62°ECutler — 38.01°N, 108.04°WVyasovka — 51.88°N, 56.29°EKugaly — 44.26°N, 76.72°EBaytugan — 56.01°N, 52.71°EIlyinskoe — 55.02°N, 48.83°EBaitugan — 58.00°N, 56.32°EMalaya Kinel — 51.86°N, 56.20°EKulchumovskaya — 51.66°N, 55.93°E

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The named rock units Seymouriamorpha has been recovered from, largest first. Drawn where the rock is now, not where it formed. 11 further formations hold fewer occurrences each and are not listed. 34 occurrences have no formation on record, which is common for older literature.

Seymouriamorpha and its relatives

Permian

Where Seymouriamorpha and its relatives were recorded in the Permian.

Found in the same rock

511 taxa

The Paleobiology Database records 74 sites for Seymouriamorpha, 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

46 references

Each of the 104 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. 34 further references are not listed. 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 Seymouriamorpha

Credit
Ryan Somma
Licence
CC BY-SA 2.0
Commercial use
the licence allows it

No 3D scan of Seymouriamorpha 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 itAmphibiosauria through timeFormations of the PermianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Watson 1917)