Eucidaris

Eucidaris is a genus of cidaroid sea urchins known as slate pencil urchins. They are characterised by a moderately thick test, a usually monocyclic apical disc, perforate and non-crenulate tubercles and nearly straight ambulacra with horizontal pore pairs. The primary spines are few and widely spaced, stout with blunt flat tips and beaded ornamentation and the secondary spines are short and apressed. They originated in the Miocene and extant members of the genus are found in the tropical Indo-Pacific Ocean, East Pacific, Atlantic Ocean and Caribbean Sea.

Eucidaris

Nhobgood ( talk ) Nick Hobgood · 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
StereocidarinaePBDB
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 51 million years on record.

The record covers at least 52 Mya to 129 ka. No occurrence read is dated outside 56 Mya to 11.7 ka.

Paleocene — about 0 of 47 occurrencesEocene — about 9 of 47 occurrencesEoceneOligocene — about 0 of 47 occurrencesMiocene — about 15 of 47 occurrencesMiocenePliocene — about 11 of 47 occurrencesPleistocene — about 12 of 47 occurrences57–55 Mya — about 2 occurrences55–53 Mya — about 4 occurrences53–51 Mya — about 3 occurrences51–50 Mya — about 0.2 occurrences50–48 Mya — about 0.2 occurrences25–23 Mya — about 0.0 occurrences23–21 Mya — about 0.5 occurrences21–19 Mya — about 1 occurrence19–17 Mya — about 1 occurrence17–15 Mya — about 3 occurrences15–13 Mya — about 4 occurrences13–11 Mya — about 2 occurrences11–9.5 Mya — about 0.8 occurrences9.5–7.6 Mya — about 0.8 occurrences7.6–5.7 Mya — about 0.8 occurrences5.7–3.8 Mya — about 4 occurrences3.8–1.9 Mya — about 7 occurrences1.9–0 Mya — about 12 occurrences52 Mya129 ka57 Mya0 Mya

47 occurrences of Eucidaris on record, most of them in the Miocene. 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

47 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

16 formations

Discovery Point — 29.00°N, 118.27°WDiscovery Point — 29.00°N, 118.23°WDiscovery Point — 29.10°N, 118.25°WTe Whanga Limestone — 43.82°S, 176.50°ETe Whanga Limestone — 43.82°S, 176.50°WTe Whanga Limestone — 44.28°S, 176.77°EPico — 34.36°N, 118.56°WPico — 34.35°N, 118.52°WTumaio Limestone — 43.75°S, 176.67°EMonterey — 33.59°N, 117.71°WTamiami — 26.13°N, 81.48°WRed Bluff Tuff — 43.97°S, 176.59°WPoivre — 20.83°S, 115.33°ENdalithoni Limestone — 17.23°S, 178.95°EFutuna Limestone — 18.22°S, 178.78°EFalmouth — 18.47°N, 77.40°WBuckingham — 25.70°N, 80.40°WBorutta — 40.83°N, 8.43°ETúxpan — 19.17°N, 96.13°WPantano — 44.49°N, 10.51°ECigarello — 44.46°N, 10.52°E

Loading coastlines…

The named rock units Eucidaris has been recovered from, largest first. Drawn where the rock is now, not where it formed. 13 occurrences have no formation on record, which is common for older literature.

Eucidaris and its relatives

Miocene

Where Eucidaris and its relatives were recorded in the Miocene.

Found in the same rock

514 taxa

The Paleobiology Database records 40 sites for Eucidaris, 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

21 references

Each of the 47 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. 9 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 content2

Picture of Eucidaris

Credit
Nhobgood ( talk ) Nick Hobgood
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

3D model

Source
Sketchfab
Licence
CC0 Public Domain
Commercial use
the licence allows it

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 itStereocidarinae through timeFormations of the MioceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.