Chama arcana

Chama arcana

via iDigBio · via iDigBio. 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
clear jewel boxPBDB
Sits inside
ChamaPBDB
Diet
suspension feederPBDB, for Chama
Life habit
epifaunalPBDB, for Chama
Motility
stationary, attached, epibiontPBDB, for Chama
Vision
blindPBDB, for Bivalvia

Time the record covers

At least 2.4 million years on record.

The record covers at least 2.58 Mya to 129 ka. No occurrence read is dated outside 5.333 Mya to 0 Mya.

Miocene — about 0 of 42 occurrencesPliocene — about 7 of 42 occurrencesPliocenePleistocene — about 35 of 42 occurrencesPleistoceneHolocene — about 0 of 42 occurrences5.4–5.3 Mya — about 0.1 occurrences5.3–5.1 Mya — about 0.2 occurrences5.1–4.9 Mya — about 0.2 occurrences4.9–4.7 Mya — about 0.2 occurrences4.7–4.5 Mya — about 0.3 occurrences4.5–4.3 Mya — about 0.3 occurrences4.3–4.1 Mya — about 0.3 occurrences4.1–3.9 Mya — about 0.3 occurrences3.9–3.7 Mya — about 0.3 occurrences3.7–3.5 Mya — about 0.6 occurrences3.5–3.3 Mya — about 0.9 occurrences3.3–3.1 Mya — about 0.9 occurrences3.1–2.9 Mya — about 0.9 occurrences2.9–2.7 Mya — about 0.9 occurrences2.7–2.5 Mya — about 1 occurrence2.5–2.3 Mya — about 1 occurrence2.3–2.1 Mya — about 1 occurrence2.1–1.9 Mya — about 1 occurrence1.9–1.8 Mya — about 1 occurrence1.8–1.6 Mya — about 0.8 occurrences1.6–1.4 Mya — about 0.7 occurrences1.4–1.2 Mya — about 0.6 occurrences1.2–972 ka Mya — about 0.6 occurrences972 ka–778 ka Mya — about 0.6 occurrences778 ka–583 ka Mya — about 3 occurrences583 ka–389 ka Mya — about 3 occurrences389 ka–194 ka Mya — about 3 occurrences194 ka–0 Mya — about 17 occurrences2.58 Mya129 ka5.8 Mya0 Mya

42 occurrences of Chama arcana 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

42 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

12 formations

Palos Verdes Sand — 33.80°N, 118.16°WPalos Verdes Sand — 33.99°N, 118.45°WPalos Verdes Sand — 33.60°N, 117.88°WPalos Verdes Sand — 33.71°N, 118.27°WUnnamed — 33.24°N, 119.47°WFernando — 34.05°N, 118.25°WFernando — 34.05°N, 118.25°WTimms Point Silt — 33.71°N, 118.27°WSan Joaquin — 35.90°N, 120.00°WCareaga Sandstone — 34.84°N, 120.41°WCareaga Sandstone — 34.90°N, 120.32°WPico — 34.36°N, 118.56°WPico — 34.33°N, 118.72°WEtchegoin — 36.02°N, 120.27°WQuaternary terrace — 33.75°N, 118.33°WLomita Marl — 33.75°N, 118.30°WPalos Verdes — 33.63°N, 117.90°WSan Pedro Sand — 33.71°N, 118.27°W

Loading coastlines…

The named rock units Chama arcana has been recovered from, largest first. Drawn where the rock is now, not where it formed. 14 occurrences have no formation on record, which is common for older literature.

Chama arcana and its relatives

Pleistocene

Where Chama arcana and its relatives were recorded in the Pleistocene.

Found in the same rock

1,113 taxa

The Paleobiology Database records 34 sites for Chama arcana, 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

5 references

Each of the 42 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 Chama arcana

Source
iDigBio
Credit
via iDigBio
Licence
not stated by the source
Commercial use
cannot be read from the licence given — check the record

No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itChama through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Bernard 1976)