Polycidaris

Polycidaris

via GBIF · CC0 · via GBIF. 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
PolycidaridaePBDB
Diet
grazer, omnivorePBDB, for Cidaroida
Life habit
low-level epifaunalPBDB, for Cidaroida
Motility
slow-movingPBDB, for Cidaroida
Vision
limitedPBDB, for Echinoidea
Environment
marinePBDB, for Cidaroida

Time the record covers

At least 84 million years on record.

The record covers at least 233.6 Mya to 149.2 Mya. No occurrence read is dated outside 237 Mya to 143.1 Mya.

Middle Triassic — about 0 of 26 occurrencesLate Triassic — about 1 of 26 occurrencesLate TriassicEarly Jurassic — about 2 of 26 occurrencesEarly JurassicMiddle Jurassic — about 6 of 26 occurrencesMiddle JurassicLate Jurassic — about 17 of 26 occurrencesLate JurassicEarly Cretaceous — about 0 of 26 occurrences239–236 Mya — about 0.4 occurrences236–232 Mya — about 0.6 occurrences187–184 Mya — about 1 occurrence184–180 Mya — about 1.0 occurrences174–171 Mya — about 0.4 occurrences171–167 Mya — about 3 occurrences167–164 Mya — about 2 occurrences164–161 Mya — about 2 occurrences161–157 Mya — about 8 occurrences157–154 Mya — about 2 occurrences154–151 Mya — about 0.8 occurrences151–148 Mya — about 3 occurrences148–144 Mya — about 3 occurrences144–141 Mya — about 0.5 occurrences233.6 Mya149.2 Mya239 Mya141 Mya

26 occurrences of Polycidaris on record, most of them in the Late Jurassic. 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

26 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

12 formations

Wildegg — 47.43°N, 8.18°EKimmeridge Clay — 50.60°N, 2.08°WKimmeridge Clay — 51.82°N, 0.81°WKimmeridge Clay — 52.42°N, 0.28°EBeacon Limestone — 50.92°N, 2.91°WCalcaire d’Audun-le-Tiche — 49.47°N, 6.02°ECassian — 46.55°N, 11.93°ELiegende Bankkalk — 48.12°N, 8.87°ETheoi Marls — 46.40°N, 0.06°WPortland — 51.74°N, 1.18°WStaffin Shale — 57.15°N, 6.11°WLochen — 48.21°N, 8.81°ENusplinger Plattenkalk — 48.13°N, 8.88°EOrnatenton — 52.28°N, 8.76°E

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The named rock units Polycidaris has been recovered from, largest first. Drawn where the rock is now, not where it formed. 4 occurrences have no formation on record, which is common for older literature.

Polycidaris and its relatives

Late Jurassic

Where Polycidaris and its relatives were recorded in the Late Jurassic.

Found in the same rock

453 taxa

The Paleobiology Database records 22 sites for Polycidaris, 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 26 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 content2

Picture of Polycidaris

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

3D model

Source
Sketchfab
Credit
svtlille
Licence
CC Attribution
Commercial use
cannot be read from the licence given — check the record

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

Keep going

What may have been alongside itPolycidaridae through timeFormations of the Late JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.