Quadragnostus

Quadragnostus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the Cambrian Period, which lasted from approximately 539 to 485 million years ago.

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

On record

Recorded, not inferred
Sits inside
PeronopsidaePBDB
Diet
suspension feederPBDB, for Agnostoidea
Life habit
nektonicPBDB, for Agnostoidea
Motility
actively mobilePBDB, for Agnostoidea
Vision
blindPBDB, for Peronopsidae
Environment
marinePBDB, for Agnostoidea

Time the record covers

At least 2.5 million years on record.

The record covers at least 499.5 Mya to 497 Mya. No occurrence read is dated outside 504.5 Mya to 486.85 Mya.

Cambrian — about 5 of 5 occurrencesCambrianOrdovician — about 0 of 5 occurrences505–504 Mya — about 0.1 occurrences504–504 Mya — about 0.4 occurrences504–503 Mya — about 0.4 occurrences503–503 Mya — about 0.4 occurrences503–502 Mya — about 0.4 occurrences502–501 Mya — about 0.4 occurrences501–501 Mya — about 0.4 occurrences501–500 Mya — about 0.4 occurrences500–499 Mya — about 0.4 occurrences499–499 Mya — about 0.2 occurrences499–498 Mya — about 0.2 occurrences498–498 Mya — about 0.2 occurrences498–497 Mya — about 0.2 occurrences497–496 Mya — about 0.1 occurrences496–496 Mya — about 0.1 occurrences496–495 Mya — about 0.1 occurrences495–494 Mya — about 0.1 occurrences494–494 Mya — about 0.1 occurrences494–493 Mya — about 0.1 occurrences493–493 Mya — about 0.1 occurrences493–492 Mya — about 0.1 occurrences492–491 Mya — about 0.1 occurrences491–491 Mya — about 0.1 occurrences491–490 Mya — about 0.1 occurrences490–489 Mya — about 0.1 occurrences489–489 Mya — about 0.1 occurrences489–488 Mya — about 0.1 occurrences488–488 Mya — about 0.1 occurrences488–487 Mya — about 0.1 occurrences487–486 Mya — about 0.0 occurrences499.5 Mya497 Mya505 Mya486.4 Mya

5 occurrences of Quadragnostus on record, most of them in the Cambrian. 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

5 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

4 formations

Alum Shale — 55.48°N, 14.30°ESt. Albans Shale — 44.48°N, 73.21°WChaya — 61.78°N, 113.02°EWheeler Shale — 39.29°N, 113.31°W

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

Quadragnostus and its relatives

Cambrian

Where Quadragnostus and its relatives were recorded in the Cambrian.

Found in the same rock

102 taxa

The Paleobiology Database records 5 sites for Quadragnostus, 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

4 references

Each of the 5 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 Quadragnostus 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 Quadragnostus, or no answer at all. This entry cannot say which.

No 3D scan of Quadragnostus 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 itPeronopsidae through timeFormations of the CambrianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Howell 1935