Diadema

Diadema is a genus of sea urchins of the family Diadematidae.

Diadema

Michael Wolf · CC BY 2.5 · 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
DiadematidaePBDB
Diet
grazerPBDB, for Diadematoida
Life habit
low-level epifaunalPBDB, for Diadematoida
Motility
slow-movingPBDB, for Diadematoida
Vision
limitedPBDB, for Echinoidea
Environment
marinePBDB, for Echinodermata

Time the record covers

At least 199 million years on record.

The record covers at least 199.5 Mya to 129 ka. No occurrence read is dated outside 201.4 Mya to 11.7 ka.

Late Triassic — about 0 of 7 occurrencesEarly Jurassic — about 1 of 7 occurrencesEarly JurassicMiddle Jurassic — about 0 of 7 occurrencesLate Jurassic — about 1 of 7 occurrencesLate JurassicEarly Cretaceous — about 1 of 7 occurrencesEarly CretaceousLate Cretaceous — about 0 of 7 occurrencesPaleocene — about 0 of 7 occurrencesEocene — about 0 of 7 occurrencesOligocene — about 1 of 7 occurrencesMiocene — about 0 of 7 occurrencesPliocene — about 1 of 7 occurrencesPleistocene — about 2 of 7 occurrences205–199 Mya — about 1 occurrence164–157 Mya — about 1 occurrence123–116 Mya — about 1 occurrence34–27 Mya — about 1.0 occurrences27–21 Mya — about 0.0 occurrences6.8–0 Mya — about 3 occurrences199.5 Mya129 ka205 Mya0 Mya

7 occurrences of Diadema on record, most of them in the Pleistocene. The Paleobiology Database records this as a living group. 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

7 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

Atherfield Clay — 50.61°N, 1.36°WFalmouth — 18.47°N, 77.40°WAlzey — 49.83°N, 7.72°ESt-Ursanne — 47.37°N, 7.17°E

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The named rock units Diadema 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.

Diadema and its relatives

Pleistocene

Where Diadema and its relatives were recorded in the Pleistocene.

Found in the same rock

303 taxa

The Paleobiology Database records 5 sites for Diadema, 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

7 references

Each of the 7 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 Diadema

Credit
Michael Wolf
Licence
CC BY 2.5
Commercial use
the licence allows it

3D model

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

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 itDiadematidae through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.