Polyplacophora

Chitons are marine molluscs of varying size in the class Polyplacophora, formerly known as Amphineura. About 940 extant and 430 fossil species are recognized.

Polyplacophora

The original uploader was Taollan82 at English Wikipedia . · 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
Also called
chitonPBDB
Sits inside
SerialiaPBDB
Diet
grazerPBDB
Life habit
epifaunalPBDB
Motility
facultatively mobile, attachedPBDB
Vision
limitedPBDB
Environment
marine,brackishPBDB

Time the record covers

At least 486 million years on record.

The record covers at least 486.85 Mya to 11.7 ka. No occurrence read is dated outside 490.2 Mya to 0 Mya.

Cambrian — about 3 of 605 occurrencesOrdovician — about 2 of 605 occurrencesOrdovicianSilurian — about 5 of 605 occurrencesDevonian — about 5 of 605 occurrencesDevonianCarboniferous — about 26 of 605 occurrencesCarboniferousPermian — about 97 of 605 occurrencesPermianEarly Triassic — about 0 of 605 occurrencesMiddle Triassic — about 0 of 605 occurrencesLate Triassic — about 0 of 605 occurrencesEarly Jurassic — about 14 of 605 occurrencesMiddle Jurassic — about 4 of 605 occurrencesLate Jurassic — about 0 of 605 occurrencesEarly Cretaceous — about 0 of 605 occurrencesLate Cretaceous — about 7 of 605 occurrencesPaleocene — about 1 of 605 occurrencesEocene — about 27 of 605 occurrencesOligocene — about 20 of 605 occurrencesMiocene — about 35 of 605 occurrencesPliocene — about 57 of 605 occurrencesPleistocene — about 293 of 605 occurrences500–483 Mya — about 3 occurrences483–467 Mya — about 1 occurrence467–450 Mya — about 0.5 occurrences450–433 Mya — about 0.5 occurrences433–417 Mya — about 5 occurrences400–383 Mya — about 4 occurrences383–367 Mya — about 0.4 occurrences367–350 Mya — about 2 occurrences350–333 Mya — about 4 occurrences333–317 Mya — about 1 occurrence317–300 Mya — about 19 occurrences300–283 Mya — about 12 occurrences283–267 Mya — about 68 occurrences267–250 Mya — about 18 occurrences217–200 Mya — about 0.1 occurrences200–183 Mya — about 14 occurrences183–167 Mya — about 4 occurrences167–150 Mya — about 2 occurrences150–133 Mya — about 0.1 occurrences117–100 Mya — about 0.1 occurrences100–83 Mya — about 0.9 occurrences83–67 Mya — about 5 occurrences67–50 Mya — about 3 occurrences50–33 Mya — about 26 occurrences33–17 Mya — about 27 occurrences17–0 Mya — about 385 occurrences486.85 Mya11.7 ka500 Mya0 Mya

605 occurrences of Polyplacophora 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

605 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

106 formations

Sabbie di Altavilla — 38.03°N, 13.53°ESabbie di Altavilla — 38.05°N, 13.55°EQuaternary terrace — 33.75°N, 118.33°WUnnamed — 33.24°N, 119.51°WUnnamed — 33.24°N, 119.55°WRoad Canyon — 30.39°N, 103.14°WRoad Canyon — 30.30°N, 103.34°WRoad Canyon — 30.36°N, 103.22°WRoad Canyon — 30.35°N, 103.27°WPalos Verdes Sand — 33.99°N, 118.45°WPalos Verdes Sand — 33.60°N, 117.88°WPalos Verdes Sand — 33.74°N, 118.28°WSan Pedro Sand — 33.74°N, 118.28°WLincoln Creek — 47.28°N, 123.52°WLincoln Creek — 46.85°N, 123.25°WLincoln Creek — 46.96°N, 123.28°WLincoln Creek — 47.66°N, 122.96°WCathedral Mountain — 30.41°N, 103.11°WCathedral Mountain — 30.34°N, 103.25°WCathedral Mountain — 30.31°N, 103.29°WCathedral Mountain — 30.39°N, 103.16°WFord — 54.88°N, 1.39°WPalos Verdes — 33.63°N, 117.90°WLazy Bend — 32.05°N, 95.50°WBone Spring — 31.28°N, 104.85°WBone Spring — 31.48°N, 104.87°WCoyote Butte — 43.95°N, 119.79°WTimms Point Silt — 33.73°N, 118.28°WSkinner Ranch — 30.27°N, 103.33°WSkinner Ranch — 30.37°N, 103.20°WSkinner Ranch — 30.20°N, 103.43°WChatton — 46.11°S, 168.80°EMandrikovka — 48.45°N, 34.98°EWord — 30.39°N, 103.18°WJames City — 35.04°N, 76.99°WVanport — 39.07°N, 82.45°WBird Spring — 36.60°N, 114.79°WBird Spring — 36.41°N, 114.85°WAkasaka — 35.39°N, 136.58°EKincses — 47.36°N, 18.38°EPico — 34.36°N, 118.56°WPico — 34.33°N, 118.72°WPico — 34.42°N, 118.70°W

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The named rock units Polyplacophora has been recovered from, largest first. Drawn where the rock is now, not where it formed. 82 further formations hold fewer occurrences each and are not listed. 218 occurrences have no formation on record, which is common for older literature.

Polyplacophora and its relatives

Pleistocene

Where Polyplacophora and its relatives were recorded in the Pleistocene.

Found in the same rock

4,632 taxa

The Paleobiology Database records 222 sites for Polyplacophora, 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

129 references

Each of the 605 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. 117 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 content2

Picture of Polyplacophora

Credit
The original uploader was Taollan82 at English Wikipedia .
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

3D model

Source
Sketchfab
Licence
CC Attribution-NonCommercial
Commercial use
the licence does not allow it

Smithsonian Open Access was 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 itSerialia through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (de Blainville 1816)