Triodus

Triodus is an extinct genus of xenacanthiform cartilaginous fish that lived from the Carboniferous to the Permian. In 2017, a new species Triodus richterae was described from the Rio do Rasto Formation of Brazil.

Triodus

Ghedoghedo · CC BY-SA 3.0 · 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
XenacanthidaePBDB
Diet
carnivorePBDB, for Xenacanthiformes
Life habit
nektobenthicPBDB, for Xenacanthiformes
Motility
actively mobilePBDB, for Xenacanthiformes

Time the record covers

At least 87 million years on record.

The record covers at least 315.2 Mya to 227.3 Mya. No occurrence read is dated outside 323.4 Mya to 205.7 Mya.

Carboniferous — about 2 of 15 occurrencesCarboniferousPermian — about 1 of 15 occurrencesPermianEarly Triassic — about 0 of 15 occurrencesMiddle Triassic — about 0 of 15 occurrencesLate Triassic — about 12 of 15 occurrencesLate Triassic326–322 Mya — about 0.2 occurrences322–318 Mya — about 0.5 occurrences318–314 Mya — about 0.3 occurrences309–305 Mya — about 0.5 occurrences305–301 Mya — about 0.5 occurrences301–297 Mya — about 0.3 occurrences297–293 Mya — about 0.7 occurrences240–236 Mya — about 0.1 occurrences236–232 Mya — about 0.4 occurrences232–228 Mya — about 0.4 occurrences228–224 Mya — about 2 occurrences224–220 Mya — about 2 occurrences220–216 Mya — about 2 occurrences216–212 Mya — about 2 occurrences212–207 Mya — about 2 occurrences207–203 Mya — about 0.9 occurrences315.2 Mya227.3 Mya326 Mya203 Mya

15 occurrences of Triodus on record, most of them in the Late Triassic. 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

5 formations

Chinle — 34.44°N, 109.46°WChinle — 34.94°N, 109.77°WChinle — 34.68°N, 109.58°WChinle — 36.33°N, 106.47°WTecovas — 33.43°N, 101.16°WTecovas — 34.96°N, 101.70°WTecovas — 35.38°N, 102.16°WBlack Prince Limestone — 31.77°N, 109.58°WMattoon — 38.44°N, 87.86°WVrchlabi — 50.63°N, 15.41°E

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

Triodus and its relatives

Late Triassic

Where Triodus and its relatives were recorded in the Late Triassic.

Found in the same rock

173 taxa

The Paleobiology Database records 13 sites for Triodus, 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

10 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 Triodus

Credit
Ghedoghedo
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

No 3D scan of Triodus 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 itXenacanthidae through timeFormations of the Late TriassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Jordan 1849