Cyrtoceras

Cyrtoceras is an dubious extinct genus of oncoceridan nautiloids that was used for fossils from the middle Ordovician to the middle Devonian, in Africa, Europe, North America and South America.

Cyrtoceras

Nobu Tamura email:nobu.tamura@yahoo.com https://spinops.blogspot.com/ · CC BY-SA 4.0 · 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
OncoceridaPBDB
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 171 million years on record.

The record covers at least 477.1 Mya to 306 Mya. No occurrence read is dated outside 486.85 Mya to 303.7 Mya.

Cambrian — about 0 of 37 occurrencesOrdovician — about 18 of 37 occurrencesOrdovicianSilurian — about 11 of 37 occurrencesSilurianDevonian — about 3 of 37 occurrencesDevonianCarboniferous — about 5 of 37 occurrencesCarboniferous491–484 Mya — about 0.6 occurrences484–478 Mya — about 1 occurrence478–471 Mya — about 0.1 occurrences471–465 Mya — about 0.6 occurrences465–459 Mya — about 0.8 occurrences459–452 Mya — about 8 occurrences452–446 Mya — about 6 occurrences446–440 Mya — about 1 occurrence440–433 Mya — about 0.7 occurrences433–427 Mya — about 3 occurrences427–421 Mya — about 6 occurrences421–414 Mya — about 1.0 occurrences395–389 Mya — about 0.4 occurrences389–383 Mya — about 3 occurrences383–376 Mya — about 0.1 occurrences357–351 Mya — about 0.2 occurrences351–344 Mya — about 0.5 occurrences344–338 Mya — about 0.3 occurrences332–325 Mya — about 1 occurrence325–319 Mya — about 0.6 occurrences306–300 Mya — about 2 occurrences477.1 Mya306 Mya491 Mya300 Mya

37 occurrences of Cyrtoceras 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

37 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

22 formations

Cliffield — 37.17°N, 81.48°WCliffield — 37.13°N, 81.48°WCliffield — 37.08°N, 81.71°WTribes Hill — 42.94°N, 74.28°WStainmore — 54.58°N, 3.53°WStainmore — 55.00°N, 1.75°WElton Beds — 52.37°N, 2.73°WRaisin River — 42.33°N, 83.05°WRochester Shale — 43.15°N, 77.62°WManitoba Limestone — 51.65°N, 99.82°WPitinga — 1.13°S, 57.75°WLindsay — 45.50°N, 81.00°WRacine — 41.85°N, 87.65°WWhitewater — 38.00°N, 85.50°WMiddle Elton — 52.00°N, 4.00°WKanouse — 41.35°N, 74.11°WFeltrim — 53.43°N, 6.20°WRochester — 43.22°N, 77.02°WWadleigh Limestone — 55.49°N, 132.36°WDecorah — 39.12°N, 90.97°WFarr — 47.45°N, 79.67°WBrassfield — 39.71°N, 84.13°WPottawatomie — 39.16°N, 94.48°WDouglas — 39.01°N, 95.25°WShihtien — 24.77°N, 99.15°E

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The named rock units Cyrtoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 10 occurrences have no formation on record, which is common for older literature.

Cyrtoceras and its relatives

Ordovician

Where Cyrtoceras and its relatives were recorded in the Ordovician.

Found in the same rock

780 taxa

The Paleobiology Database records 37 sites for Cyrtoceras, 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

24 references

Each of the 37 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. 12 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 Cyrtoceras

Credit
Nobu Tamura email:nobu.tamura@yahoo.com https://spinops.blogspot.com/
Licence
CC BY-SA 4.0
Commercial use
the licence allows it

No 3D scan of Cyrtoceras 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 itOncocerida through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Goldfuss 1832