Polymesoda

Polymesoda is a genus of clams in the family Cyrenidae. The genus was previously classified in the family Corbiculidae, before it was subsumed into Cyrenidae.

Polymesoda

Veronidae · 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
CorbiculidaePBDB
Diet
suspension feederPBDB
Life habit
infaunalPBDB
Motility
facultatively mobilePBDB
Vision
blindPBDB, for Bivalvia
Environment
brackish,freshwaterPBDB, for Corbiculidae

Time the record covers

At least 61 million years on record.

The record covers at least 61.66 Mya to 11.7 ka. No occurrence read is dated outside 66 Mya to 0 Mya.

Late Cretaceous — about 0 of 72 occurrencesPaleocene — about 5 of 72 occurrencesPaleoceneEocene — about 21 of 72 occurrencesEoceneOligocene — about 25 of 72 occurrencesOligoceneMiocene — about 12 of 72 occurrencesMiocenePliocene — about 6 of 72 occurrencesPleistocene — about 2 of 72 occurrences67–65 Mya — about 0.5 occurrences65–63 Mya — about 1 occurrence63–61 Mya — about 0.9 occurrences61–58 Mya — about 1.0 occurrences58–56 Mya — about 1 occurrence56–54 Mya — about 0.3 occurrences54–52 Mya — about 0.3 occurrences52–49 Mya — about 0.3 occurrences49–47 Mya — about 0.8 occurrences47–45 Mya — about 1 occurrence45–43 Mya — about 1 occurrence43–40 Mya — about 2 occurrences40–38 Mya — about 2 occurrences38–36 Mya — about 6 occurrences36–34 Mya — about 7 occurrences34–31 Mya — about 6 occurrences31–29 Mya — about 6 occurrences29–27 Mya — about 6 occurrences27–25 Mya — about 4 occurrences25–22 Mya — about 4 occurrences22–20 Mya — about 2 occurrences20–18 Mya — about 1.0 occurrences18–16 Mya — about 1 occurrence16–13 Mya — about 4 occurrences13–11 Mya — about 1.0 occurrences11–9.0 Mya — about 0.7 occurrences9.0–6.7 Mya — about 0.7 occurrences6.7–4.5 Mya — about 2 occurrences4.5–2.2 Mya — about 5 occurrences2.2–0 Mya — about 3 occurrences61.66 Mya11.7 ka67 Mya0 Mya

72 occurrences of Polymesoda on record, most of them in the Oligocene. 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

72 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

39 formations

Bembridge Marls — 50.71°N, 1.45°WBorgloon — 50.80°N, 5.33°EBorgloon — 50.82°N, 5.46°EBorgloon — 50.89°N, 5.64°EBorgloon — 51.00°N, 4.50°EHempstead — 50.71°N, 1.45°WWoolwich and Reading — 51.52°N, 0.08°WSelsey — 50.73°N, 0.78°WUpper Cyrena — 47.50°N, 19.08°ETemblor — 35.95°N, 120.25°WSable de Vauroux-Saint-Antoine — 48.43°N, 2.15°ESable de Vauroux-Saint-Antoine — 48.50°N, 2.25°ESilverado — 33.79°N, 117.72°WMancora — 5.20°S, 80.63°WPamlico — 32.69°N, 80.23°WPamlico — 35.50°N, 76.27°WWakkanabi — 43.50°N, 142.00°EYoshino — 35.10°N, 134.19°EConglomerat de Pierrefitte — 48.50°N, 2.25°ECalcaire de Mons — 50.45°N, 3.93°ENeuwieder Becken 3 — 50.43°N, 7.47°ENeuwieder Becken 6 — 50.43°N, 7.47°ENeuwieder Becken 7a — 50.43°N, 7.47°ENeuwieder Becken 7b — 50.43°N, 7.47°EJewett — 35.49°N, 118.85°WBembridge Limestone — 50.68°N, 1.10°WFalun d'Ormoy — 48.40°N, 2.15°EBohio — 9.17°N, 79.85°WAmaninskaya — 58.00°N, 158.20°E

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The named rock units Polymesoda has been recovered from, largest first. Drawn where the rock is now, not where it formed. 15 further formations hold fewer occurrences each and are not listed. 10 occurrences have no formation on record, which is common for older literature.

Polymesoda and its relatives

Oligocene

Where Polymesoda and its relatives were recorded in the Oligocene.

Found in the same rock

1,199 taxa

The Paleobiology Database records 48 sites for Polymesoda, 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

32 references

Each of the 72 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. 20 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 Polymesoda

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

No 3D scan of Polymesoda 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 itCorbiculidae through timeFormations of the OligoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Rafinesque 1828