Acar

Acar is a genus of small saltwater clams, marine bivalve mollusks in the family Arcidae, the ark clams.

Acar

James St. John · CC BY 2.0 · 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
Also called
miniature 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 least 65 million years on record.

The record covers at least 66 Mya to 11.7 ka. No occurrence read is dated outside 83.6 Mya to 0 Mya.

Late Cretaceous — about 5 of 199 occurrencesLate CretaceousPaleocene — about 12 of 199 occurrencesPaleoceneEocene — about 25 of 199 occurrencesEoceneOligocene — about 6 of 199 occurrencesOligoceneMiocene — about 51 of 199 occurrencesMiocenePliocene — about 33 of 199 occurrencesPleistocene — about 63 of 199 occurrences85–82 Mya — about 0.1 occurrences82–80 Mya — about 0.2 occurrences80–77 Mya — about 0.2 occurrences77–74 Mya — about 0.2 occurrences74–71 Mya — about 0.9 occurrences71–68 Mya — about 2 occurrences68–65 Mya — about 3 occurrences65–63 Mya — about 7 occurrences63–60 Mya — about 3 occurrences60–57 Mya — about 0.5 occurrences57–54 Mya — about 1 occurrence54–51 Mya — about 2 occurrences51–48 Mya — about 2 occurrences48–45 Mya — about 0.8 occurrences45–43 Mya — about 0.7 occurrences43–40 Mya — about 5 occurrences40–37 Mya — about 8 occurrences37–34 Mya — about 5 occurrences34–31 Mya — about 1 occurrence31–28 Mya — about 0.9 occurrences28–26 Mya — about 2 occurrences26–23 Mya — about 3 occurrences23–20 Mya — about 5 occurrences20–17 Mya — about 4 occurrences17–14 Mya — about 9 occurrences14–11 Mya — about 15 occurrences11–8.5 Mya — about 4 occurrences8.5–5.7 Mya — about 11 occurrences5.7–2.8 Mya — about 30 occurrences2.8–0 Mya — about 72 occurrences66 Mya11.7 ka85 Mya0 Mya

199 occurrences of Acar 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

199 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

81 formations

Cook Mountain — 32.04°N, 88.73°WCook Mountain — 32.10°N, 88.86°WCook Mountain — 32.32°N, 89.03°WCook Mountain — 32.14°N, 89.00°WTalparo — 10.67°N, 61.07°WWaimanalo — 21.35°N, 158.12°WWaimanalo — 21.45°N, 157.72°WWaimanalo — 21.27°N, 157.75°WWaimanalo — 21.30°N, 157.87°WBowden — 17.88°N, 76.28°WArcadia — 27.89°N, 82.48°WArcadia — 30.48°N, 84.02°WArcadia — 30.70°N, 84.80°WArcadia — 30.77°N, 84.82°WBelmont — 32.33°N, 64.69°WBelmont — 32.36°N, 64.71°WDevonshire — 32.30°N, 64.75°WDevonshire — 32.28°N, 64.77°WDevonshire — 32.30°N, 64.86°WMoin — 9.99°N, 83.05°WMoin — 10.01°N, 83.06°WMoodys Branch — 32.30°N, 90.18°WMoodys Branch — 31.66°N, 92.90°WMare — 10.61°N, 63.52°WMare — 10.64°N, 64.11°WShoal River — 30.65°N, 86.04°WShoal River — 30.72°N, 86.12°WGrotto Beach — 24.03°N, 74.52°WAgueguexquite — 18.15°N, 94.42°WAgueguexquite — 18.07°N, 94.32°WPoudingue de Ciply — 50.42°N, 3.95°ECalcaire de Eisden — 50.98°N, 5.70°ETagpochau — 15.18°N, 145.76°ECulebra — 9.08°N, 79.68°WCulebra — 9.03°N, 79.63°WIronshore — 19.33°N, 81.25°WReklaw — 30.01°N, 97.25°WReklaw — 30.81°N, 96.65°WBateque — 26.75°N, 113.00°WEwekoro — 6.92°N, 3.19°EVejle Fjord — 55.18°N, 11.88°ECalcaire de Vigny — 49.07°N, 1.92°ECalcaire de Mons — 50.45°N, 3.93°E

Loading coastlines…

The named rock units Acar has been recovered from, largest first. Drawn where the rock is now, not where it formed. 57 further formations hold fewer occurrences each and are not listed. 70 occurrences have no formation on record, which is common for older literature.

Acar and its relatives

Pleistocene

Where Acar and its relatives were recorded in the Pleistocene.

Found in the same rock

2,731 taxa

The Paleobiology Database records 117 sites for Acar, and this reads all 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

87 references

Each of the 199 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. 75 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 Acar

Credit
James St. John
Licence
CC BY 2.0
Commercial use
the licence allows it

No 3D scan of Acar 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 PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Gray 1857)