Amphicyrtoceras

Amphicyrtoceras

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
AcleistoceratidaePBDB
Diet
carnivorePBDB, for Oncocerida
Life habit
nektobenthicPBDB, for Oncocerida
Motility
fast-movingPBDB, for Cephalopoda
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Cephalopoda

Time the record covers

At least 12 million years on record.

The record covers at least 445.2 Mya to 432.9 Mya. No occurrence read is dated outside 448.8 Mya to 426.7 Mya.

Ordovician — about 1 of 25 occurrencesOrdovicianSilurian — about 24 of 25 occurrencesSilurian449–449 Mya — about 0.1 occurrences449–448 Mya — about 0.2 occurrences448–447 Mya — about 0.2 occurrences447–446 Mya — about 0.2 occurrences446–445 Mya — about 0.2 occurrences445–445 Mya — about 0.1 occurrences443–442 Mya — about 0.2 occurrences442–442 Mya — about 0.2 occurrences442–441 Mya — about 0.2 occurrences441–440 Mya — about 1 occurrence440–439 Mya — about 2 occurrences439–439 Mya — about 2 occurrences439–438 Mya — about 1 occurrence438–437 Mya — about 1 occurrence437–436 Mya — about 1 occurrence436–435 Mya — about 1 occurrence435–435 Mya — about 1 occurrence435–434 Mya — about 1 occurrence434–433 Mya — about 1 occurrence433–432 Mya — about 2 occurrences432–432 Mya — about 2 occurrences432–431 Mya — about 2 occurrences431–430 Mya — about 0.9 occurrences430–429 Mya — about 0.3 occurrences429–429 Mya — about 0.3 occurrences429–428 Mya — about 0.3 occurrences428–427 Mya — about 0.3 occurrences427–426 Mya — about 0.1 occurrences445.2 Mya432.9 Mya449.3 Mya426.2 Mya

25 occurrences of Amphicyrtoceras on record, most of them in the Silurian. 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

25 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

8 formations

Racine — 42.73°N, 87.78°WRacine — 42.88°N, 88.04°WRacine — 43.05°N, 88.01°WJupiter — 49.47°N, 63.62°WJupiter — 49.38°N, 63.60°WJupiter — 49.19°N, 61.73°WScotch Grove — 41.90°N, 90.60°WHopkinton — 43.00°N, 91.00°WInwood — 53.17°N, 99.28°WAtikameg Dolomite — 53.94°N, 100.15°WHusbergøya — 59.92°N, 10.72°ELa Vieille — 48.20°N, 64.80°W

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

Amphicyrtoceras and its relatives

Silurian

Where Amphicyrtoceras and its relatives were recorded in the Silurian.

Found in the same rock

306 taxa

The Paleobiology Database records 19 sites for Amphicyrtoceras, 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

7 references

Each of the 25 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 Amphicyrtoceras

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

No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itAcleistoceratidae through timeFormations of the SilurianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Foerste 1924