Achistrum

Achistrum is an extinct genus of sea cucumber which existed in Poland during the Triassic period, and the United States during the Carboniferous period. It contains the species Achistrum nicholsoni and Achistrum ludwigi.

Achistrum

Ghedoghedo · 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
AchistridaePBDB
Diet
detritivorePBDB, for Apodida
Life habit
epifaunalPBDB, for Apodida
Motility
actively mobilePBDB, for Apodida
Vision
blindPBDB, for Holothuroidea
Environment
marinePBDB, for Echinodermata

Time the record covers

At least 280 million years on record.

The record covers at least 393.47 Mya to 113.2 Mya. No occurrence read is dated outside 410.62 Mya to 100.5 Mya.

Devonian — about 13 of 165 occurrencesDevonianCarboniferous — about 27 of 165 occurrencesCarboniferousPermian — about 8 of 165 occurrencesPermianEarly Triassic — about 0 of 165 occurrencesMiddle Triassic — about 11 of 165 occurrencesLate Triassic — about 7 of 165 occurrencesLate TriassicEarly Jurassic — about 15 of 165 occurrencesEarly JurassicMiddle Jurassic — about 45 of 165 occurrencesLate Jurassic — about 38 of 165 occurrencesEarly Cretaceous — about 1 of 165 occurrencesEarly CretaceousLate Cretaceous — about 0 of 165 occurrences417–406 Mya — about 0.8 occurrences406–395 Mya — about 2 occurrences395–385 Mya — about 3 occurrences385–374 Mya — about 7 occurrences374–363 Mya — about 0.5 occurrences363–352 Mya — about 14 occurrences352–342 Mya — about 5 occurrences342–331 Mya — about 0.5 occurrences331–320 Mya — about 0.2 occurrences320–309 Mya — about 3 occurrences309–299 Mya — about 4 occurrences299–288 Mya — about 3 occurrences266–256 Mya — about 4 occurrences256–245 Mya — about 2 occurrences245–234 Mya — about 12 occurrences234–223 Mya — about 1 occurrence223–213 Mya — about 0.3 occurrences213–202 Mya — about 2 occurrences202–191 Mya — about 13 occurrences191–180 Mya — about 2 occurrences180–170 Mya — about 1 occurrence170–159 Mya — about 54 occurrences159–148 Mya — about 28 occurrences116–105 Mya — about 0.6 occurrences105–94 Mya — about 0.4 occurrences393.47 Mya113.2 Mya417 Mya94 Mya

165 occurrences of Achistrum on record, most of them in the Middle Jurassic. 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

165 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

34 formations

Hazelbury Bryan — 50.01°N, 2.29°WAmpthill Clay — 53.72°N, 0.53°WRockford Limestone — 38.48°N, 85.75°WRockford Limestone — 40.83°N, 87.25°WScheibelberg — 47.62°N, 12.58°ELodgepole limestone — 45.68°N, 111.03°WChouteau limestone — 38.85°N, 92.45°WBlue Lias — 51.40°N, 2.45°WBlue Lias — 51.89°N, 2.27°WBlue Lias — 52.29°N, 1.39°WBreathitt — 37.63°N, 82.64°WKowala — 50.83°N, 20.37°EKowala — 50.82°N, 20.58°EKowala — 50.80°N, 20.47°ECompton limestone — 37.70°N, 93.80°WWoodrow Clay — 50.01°N, 2.29°WBuchenstein — 46.88°N, 17.60°EFurkaska — 49.27°N, 19.81°ENewton Clay — 50.01°N, 2.29°WFlorena — 39.14°N, 96.50°WFlorena — 38.62°N, 96.36°WGraford — 33.20°N, 97.75°WFüred — 46.88°N, 17.60°EVäszoly — 46.88°N, 17.60°EHallstatt — 47.90°N, 16.10°EJulfa — 38.94°N, 45.58°EBell Canyon — 31.88°N, 104.80°WEdwardsville — 39.00°N, 86.33°WChaiburi — 7.12°N, 100.17°EAllan Mountain limestone — 45.68°N, 111.03°W

Loading coastlines…

The named rock units Achistrum has been recovered from, largest first. Drawn where the rock is now, not where it formed. 10 further formations hold fewer occurrences each and are not listed. 69 occurrences have no formation on record, which is common for older literature.

Achistrum and its relatives

Middle Jurassic

Where Achistrum and its relatives were recorded in the Middle Jurassic.

Found in the same rock

874 taxa

The Paleobiology Database records 107 sites for Achistrum, 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

41 references

Each of the 165 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. 29 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 Achistrum

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

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

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 itAchistridae through timeFormations of the Middle JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Etheridge 1881