Clarkoceras

Clarkoceras is a genus of breviconic ellesmerocerid cephalopods, one of only two genera known to have crossed from the Late Cambrian, Trempealeauan, into the Early Ordovician, Gasconadian. ; the other being Ectenolites.

No picture of Clarkoceras was found. Wikipedia, Wikidata and iDigBio were searched and had none. Smithsonian Open Access did not answer, so this is what the others held rather than everything there is. GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Clarkoceras, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
EllesmeroceratidaePBDB
Diet
carnivorePBDB, for Cephalopoda
Life habit
nektobenthic, solitaryPBDB, for Ellesmerocerida
Motility
actively mobilePBDB, for Ellesmerocerida
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Ellesmerocerida

Time the record covers

At most 18 million years on record.

Every occurrence read is dated to somewhere between 488.9 Mya and 471.3 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Cambrian — about 1 of 69 occurrencesCambrianOrdovician — about 68 of 69 occurrencesOrdovician489–489 Mya — about 0.1 occurrences489–488 Mya — about 0.3 occurrences488–488 Mya — about 0.3 occurrences488–487 Mya — about 0.3 occurrences487–486 Mya — about 4 occurrences486–486 Mya — about 5 occurrences486–485 Mya — about 5 occurrences485–484 Mya — about 5 occurrences484–484 Mya — about 5 occurrences484–483 Mya — about 5 occurrences483–483 Mya — about 4 occurrences483–482 Mya — about 4 occurrences482–481 Mya — about 4 occurrences481–481 Mya — about 4 occurrences481–480 Mya — about 4 occurrences480–479 Mya — about 4 occurrences479–479 Mya — about 4 occurrences479–478 Mya — about 4 occurrences478–478 Mya — about 4 occurrences478–477 Mya — about 3 occurrences477–476 Mya — about 0.2 occurrences476–476 Mya — about 0.2 occurrences476–475 Mya — about 0.2 occurrences475–475 Mya — about 0.2 occurrences475–474 Mya — about 0.2 occurrences474–473 Mya — about 0.2 occurrences473–473 Mya — about 0.2 occurrences473–472 Mya — about 0.2 occurrences472–471 Mya — about 0.2 occurrences471–471 Mya — about 0.0 occurrences489.4 Mya470.8 Mya

69 occurrences of Clarkoceras 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

69 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

Gasconade — 38.10°N, 91.13°WGasconade — 37.14°N, 91.35°WGasconade — 38.97°N, 91.21°WOneota Dolomite — 43.71°N, 91.42°WOneota Dolomite — 44.23°N, 91.92°WOneota Dolomite — 44.40°N, 92.08°WOneota Dolomite — 43.02°N, 91.18°WOneota Dolomite — 43.54°N, 91.18°WOneota Dolomite — 43.12°N, 90.50°WOneota Dolomite — 44.07°N, 91.94°WGreat Meadows — 43.91°N, 73.42°WGreat Meadows — 43.42°N, 73.48°WGasconade Dolomite — 38.35°N, 93.07°WGasconade Dolomite — 37.95°N, 91.38°WGasconade Dolomite — 38.29°N, 90.96°WGasconade Dolomite — 37.04°N, 91.06°WOneota — 43.90°N, 91.34°WOneota — 43.13°N, 90.71°WOneota — 43.58°N, 91.22°WChepultepec — 36.75°N, 82.25°WChepultepec — 36.45°N, 83.57°WChepultepec — 35.07°N, 85.58°WChepultepec — 35.87°N, 84.68°WTribes Hill — 43.47°N, 73.41°WTribes Hill — 42.94°N, 74.28°WTribes Hill — 43.00°N, 74.73°WTribes Hill — 43.56°N, 73.40°WTanyard — 30.27°N, 97.74°WTanyard — 30.46°N, 99.13°WTanyard — 31.07°N, 98.70°WXilingxia — 33.00°N, 111.00°ESanta Rosita — 24.00°S, 66.00°WMons — 51.90°N, 115.93°W

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The named rock units Clarkoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 3 occurrences have no formation on record, which is common for older literature.

Clarkoceras and its relatives

Ordovician

Where Clarkoceras and its relatives were recorded in the Ordovician.

Found in the same rock

186 taxa

The Paleobiology Database records 39 sites for Clarkoceras, 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 69 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 content0

No picture of Clarkoceras was found. Wikipedia, Wikidata and iDigBio were searched and had none.

Smithsonian Open Access did not answer, so this is what the others held rather than everything there is.

GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Clarkoceras, or no answer at all. This entry cannot say which.

No 3D scan of Clarkoceras 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 itEllesmeroceratidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Ruedemann 1905