Circulocrania

Circulocrania is an extinct genus of trilobites in the family Cyclopygidae. The genus lived during the later part of the Arenig stage of the Ordovician Period, approximately 478 to 471 million years ago.

No picture of Circulocrania 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 Circulocrania, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
CyclopygidaePBDB
Diet
microcarnivorePBDB, for Cyclopygidae
Life habit
nektonicPBDB, for Cyclopygidae
Motility
actively mobilePBDB, for Cyclopygidae
Vision
well-developedPBDB, for Cyclopygidae
Environment
marinePBDB, for Trilobita

Time the record covers

At most 9.1 million years on record.

The one occurrence read is dated to somewhere between 477.1 Mya and 468 Mya, which is a dating window rather than a span.

Ordovician — about 1 of 1 occurrenceOrdovician477–477 Mya — about 0.0 occurrences477–477 Mya — about 0.0 occurrences477–476 Mya — about 0.0 occurrences476–476 Mya — about 0.0 occurrences476–476 Mya — about 0.0 occurrences476–475 Mya — about 0.0 occurrences475–475 Mya — about 0.0 occurrences475–475 Mya — about 0.0 occurrences475–474 Mya — about 0.0 occurrences474–474 Mya — about 0.0 occurrences474–474 Mya — about 0.0 occurrences474–473 Mya — about 0.0 occurrences473–473 Mya — about 0.0 occurrences473–473 Mya — about 0.0 occurrences473–472 Mya — about 0.0 occurrences472–472 Mya — about 0.0 occurrences472–472 Mya — about 0.0 occurrences472–471 Mya — about 0.0 occurrences471–471 Mya — about 0.0 occurrences471–471 Mya — about 0.0 occurrences471–470 Mya — about 0.0 occurrences470–470 Mya — about 0.0 occurrences470–470 Mya — about 0.0 occurrences470–469 Mya — about 0.0 occurrences469–469 Mya — about 0.0 occurrences469–469 Mya — about 0.0 occurrences469–468 Mya — about 0.0 occurrences468–468 Mya — about 0.0 occurrences477.6 Mya467.5 Mya

1 occurrence of Circulocrania 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

1 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

1 formation

Pontyfenni — 52.00°N, 5.00°W

Loading coastlines…

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

Circulocrania and its relatives

Ordovician

Where Circulocrania and its relatives were recorded in the Ordovician.

Found in the same rock

34 taxa

The Paleobiology Database records 1 site for Circulocrania, 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

1 reference

Each of the 1 occurrence 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. Each entry links to the Paleobiology Database's own record for the work.

Media and terms

Media content0

No picture of Circulocrania 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 Circulocrania, or no answer at all. This entry cannot say which.

No 3D scan of Circulocrania 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 itCyclopygidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Fortey and Owens 1987