Hemicidaroida

The subclass Euechinoidea includes almost all living species of sea urchin, with fossil forms going back as far as the Triassic.

Hemicidaroida

Frédéric Ducarme · CC BY-SA 3.0 · 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
StirodontaPBDB
Diet
grazerPBDB
Life habit
low-level epifaunalPBDB
Motility
slow-movingPBDB
Vision
limitedPBDB, for Echinoidea
Environment
marinePBDB

Time the record covers

At least 27 million years on record.

The record covers at least 121.4 Mya to 93.9 Mya. No occurrence read is dated outside 125.77 Mya to 89.8 Mya.

Early Cretaceous — about 2 of 34 occurrencesEarly CretaceousLate Cretaceous — about 32 of 34 occurrencesLate Cretaceous126–125 Mya — about 0.1 occurrences125–124 Mya — about 0.3 occurrences124–123 Mya — about 0.3 occurrences123–122 Mya — about 0.3 occurrences122–120 Mya — about 0.2 occurrences120–119 Mya — about 0.2 occurrences119–118 Mya — about 0.2 occurrences118–117 Mya — about 0.2 occurrences117–115 Mya — about 0.2 occurrences115–114 Mya — about 0.2 occurrences114–113 Mya — about 0.1 occurrences102–100 Mya — about 0.8 occurrences100–99 Mya — about 5 occurrences99–98 Mya — about 5 occurrences98–97 Mya — about 5 occurrences97–95 Mya — about 5 occurrences95–94 Mya — about 5 occurrences94–93 Mya — about 2 occurrences93–92 Mya — about 2 occurrences92–90 Mya — about 2 occurrences90–89 Mya — about 0.7 occurrences121.4 Mya93.9 Mya126.5 Mya89.1 Mya

34 occurrences of Hemicidaroida on record, most of them in the Late Cretaceous. 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

34 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

14 formations

Kanawa Limestones — 10.30°N, 11.38°EKanawa Limestones — 10.50°N, 11.84°ECotinguiba — 11.29°S, 37.38°WCotinguiba — 10.63°S, 36.95°WGalala — 30.38°N, 33.52°EGalala — 29.28°N, 34.72°EMauddud — 25.90°N, 56.07°EWilmington Sands — 50.80°N, 0.18°EPindiga — 10.28°N, 11.32°EPindiga — 9.98°N, 10.93°EWasia — 24.39°N, 47.75°EWasia — 27.95°N, 43.90°EMiraflores — 18.77°S, 66.10°WQishn — 14.30°N, 48.49°EGrizzle — 50.80°N, 0.18°ERisan Aneiza — 31.00°N, 33.50°EGongila — 11.03°N, 11.35°ERaha — 28.65°N, 33.24°EAbu Qada — 29.67°N, 34.50°E

Loading coastlines…

The named rock units Hemicidaroida has been recovered from, largest first. Drawn where the rock is now, not where it formed. 7 occurrences have no formation on record, which is common for older literature.

Hemicidaroida and its relatives

Late Cretaceous

Where Hemicidaroida and its relatives were recorded in the Late Cretaceous.

Found in the same rock

167 taxa

The Paleobiology Database records 28 sites for Hemicidaroida, 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

17 references

Each of the 34 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. 5 further references are not listed. 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 content1

Picture of Hemicidaroida

Credit
Frédéric Ducarme
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.

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 itStirodonta through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Beurlen 1937)