Arbacia

Arbacia is a genus of sea urchins, widespread in the Atlantic and eastern Pacific oceans.

Arbacia

Uncredited · 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
ArbaciidaePBDB
Diet
grazerPBDB, for Arbaciidae
Life habit
epifaunalPBDB, for Arbaciidae
Motility
actively mobilePBDB, for Arbaciidae
Vision
limitedPBDB, for Echinoidea
Environment
marinePBDB, for Echinodermata

Time the record covers

At least 130 million years on record.

The record covers at least 132.6 Mya to 2.58 Mya. No occurrence read is dated outside 137.05 Mya to 11.7 ka.

Early Cretaceous — about 1 of 17 occurrencesEarly CretaceousLate Cretaceous — about 0 of 17 occurrencesPaleocene — about 0 of 17 occurrencesEocene — about 0 of 17 occurrencesOligocene — about 1 of 17 occurrencesMiocene — about 3 of 17 occurrencesMiocenePliocene — about 10 of 17 occurrencesPleistocene — about 3 of 17 occurrences140–135 Mya — about 0.4 occurrences135–130 Mya — about 0.6 occurrences28–23 Mya — about 0.9 occurrences23–19 Mya — about 0.1 occurrences14–9.3 Mya — about 0.6 occurrences9.3–4.7 Mya — about 5 occurrences4.7–0 Mya — about 9 occurrences132.6 Mya2.58 Mya140 Mya0 Mya

17 occurrences of Arbacia on record, most of them in the Pliocene. 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

17 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

8 formations

Yorktown — 35.36°N, 76.82°WYorktown — 37.03°N, 76.60°WYorktown — 37.06°N, 76.33°WWaccamaw — 33.84°N, 78.68°WTamiami — 26.13°N, 81.48°WGoose Creek — 33.33°N, 80.15°WCroatan — 35.36°N, 76.82°WScotts Mills — 45.05°N, 122.57°WDuplin — 33.93°N, 79.48°WSeroe Domi — 12.15°N, 68.99°W

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The named rock units Arbacia has been recovered from, largest first. Drawn where the rock is now, not where it formed. 5 occurrences have no formation on record, which is common for older literature.

Arbacia and its relatives

Pliocene

Where Arbacia and its relatives were recorded in the Pliocene.

Found in the same rock

738 taxa

The Paleobiology Database records 15 sites for Arbacia, 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

12 references

Each of the 17 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 Arbacia

Credit
nobody named on the record
Licence
not stated by the source
Commercial use
cannot be read from the licence given — check the record

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 itArbaciidae through timeFormations of the PlioceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Gray 1835