Helminthochiton

Helminthochiton is an extinct genus of polyplacophoran mollusc. Helminthochiton became extinct during the Permian period.

Helminthochiton

via iDigBio · CC0 · via iDigBio. 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
HelminthochitonidaePBDB

Time the record covers

At least 193 million years on record.

The record covers at least 453.8 Mya to 259.857 Mya. No occurrence read is dated outside 457.3 Mya to 254.14 Mya.

Ordovician — about 5 of 16 occurrencesOrdovicianSilurian — about 0 of 16 occurrencesDevonian — about 3 of 16 occurrencesDevonianCarboniferous — about 5 of 16 occurrencesCarboniferousPermian — about 3 of 16 occurrencesPermianEarly Triassic — about 0 of 16 occurrences461–454 Mya — about 3 occurrences454–447 Mya — about 2 occurrences426–419 Mya — about 0.1 occurrences419–412 Mya — about 0.9 occurrences391–384 Mya — about 1 occurrence384–377 Mya — about 0.6 occurrences321–313 Mya — about 0.1 occurrences313–306 Mya — about 4 occurrences306–299 Mya — about 1 occurrence292–285 Mya — about 0.7 occurrences285–278 Mya — about 0.9 occurrences278–271 Mya — about 0.4 occurrences264–257 Mya — about 0.5 occurrences257–250 Mya — about 0.5 occurrences453.8 Mya259.857 Mya461 Mya250 Mya

16 occurrences of Helminthochiton on record, most of them in the Ordovician. 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

16 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

11 formations

Lexington Limestone — 37.84°N, 84.46°WLexington Limestone — 37.64°N, 84.66°WLexington Limestone — 37.89°N, 84.51°WLexington Limestone — 37.69°N, 84.76°WVanport — 39.07°N, 82.45°WVanport — 40.99°N, 80.33°WTorquay — 50.47°N, 3.50°WLoray — 39.21°N, 114.98°WGarra — 33.95°S, 148.82°EBird Spring — 36.60°N, 114.79°WFrancis — 34.76°N, 96.68°WLazy Bend — 32.05°N, 95.50°WEpiskopi — 37.33°N, 23.46°EPutnam Hill — 40.48°N, 81.45°WLexington — 37.99°N, 84.82°W

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

Helminthochiton and its relatives

Ordovician

Where Helminthochiton and its relatives were recorded in the Ordovician.

Found in the same rock

421 taxa

The Paleobiology Database records 16 sites for Helminthochiton, 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 16 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 Helminthochiton

Source
iDigBio
Credit
via iDigBio
Licence
CC0
Commercial use
the licence allows it

No 3D scan of Helminthochiton 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 itHelminthochitonidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Salter 1846