Arca

Searched as Arca keideli. The Paleobiology Database treats Arca as the accepted name.

Arca is a genus of edible saltwater clams in the family Arcidae, the Ark Clams.

Arca

Uncredited · 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
Also called
arkPBDB
Sits inside
ArcinaePBDB
Diet
suspension feederPBDB
Life habit
epifaunalPBDB
Motility
stationary, attachedPBDB
Vision
limitedPBDB, for Arcidae
Environment
lagoonal,coastal,inner shelf,outer shelf,oceanic,brackish,freshwaterPBDB, for Arcidae

Time the record covers

At most 8.1 million years on record.

Every occurrence read is dated to somewhere between 145.06 Mya and 137.05 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Late Jurassic — about 1 of 3 occurrencesLate JurassicEarly Cretaceous — about 2 of 3 occurrencesEarly Cretaceous145–145 Mya — about 0.1 occurrences145–145 Mya — about 0.2 occurrences145–144 Mya — about 0.2 occurrences144–144 Mya — about 0.2 occurrences144–144 Mya — about 0.2 occurrences144–143 Mya — about 0.2 occurrences143–143 Mya — about 0.2 occurrences143–143 Mya — about 0.2 occurrences143–143 Mya — about 0.2 occurrences143–142 Mya — about 0.2 occurrences142–142 Mya — about 0.2 occurrences142–142 Mya — about 0.2 occurrences142–141 Mya — about 0.2 occurrences141–141 Mya — about 0.2 occurrences141–141 Mya — about 0.1 occurrences141–140 Mya — about 0.1 occurrences140–140 Mya — about 0.1 occurrences140–140 Mya — about 0.1 occurrences140–140 Mya — about 0.1 occurrences140–139 Mya — about 0.1 occurrences139–139 Mya — about 0.1 occurrences139–139 Mya — about 0.1 occurrences139–138 Mya — about 0.1 occurrences138–138 Mya — about 0.1 occurrences138–138 Mya — about 0.1 occurrences138–137 Mya — about 0.1 occurrences137–137 Mya — about 0.1 occurrences137–137 Mya — about 0.0 occurrences145.6 Mya136.6 Mya

3 occurrences of Arca on record, most of them in the Early Cretaceous. The Paleobiology Database records this as a living group, and the chart stops with its fossils rather than at the present. 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

3 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

1 formation

Vaca Muerta — 38.55°S, 70.08°W

Loading coastlines…

The named rock units Arca has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Arca and its relatives

Early Cretaceous

Where Arca and its relatives were recorded in the Early Cretaceous.

Found in the same rock

3,585 taxa

The Paleobiology Database records 512 sites for Arca, and this reads 240 of them. Of that, one read hit the database's own return limit, so every count below is a floor rather than a total. 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

1 reference

Each of the 3 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. Each entry links to the Paleobiology Database's own record for the work.

Media and terms

Media content1

Picture of Arca

Credit
nobody named on the record
Licence
CC BY 2.5
Commercial use
the licence allows it

No 3D scan of Arca was found in Sketchfab.

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 itArcinae through timeFormations of the Early CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Linnaeus 1758