Sismondia arnoldi

Sismondia arnoldi

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
Sits inside
SismondiaPBDB
Diet
detritivorePBDB, for Clypeasteroida
Life habit
semi-infaunalPBDB, for Clypeasteroida
Motility
slow-movingPBDB, for Clypeasteroida
Vision
limitedPBDB, for Echinoidea
Environment
marinePBDB, for Echinodermata

Time the record covers

At least 3.4 million years on record.

The record covers at least 3.6 Mya to 129 ka. No occurrence read is dated outside 11.63 Mya to 11.7 ka.

Miocene — about 1 of 2 occurrencesMiocenePliocene — about 0 of 2 occurrencesPliocenePleistocene — about 1 of 2 occurrencesPleistoceneHolocene — about 0 of 2 occurrences12–11 Mya — about 0.0 occurrences11–11 Mya — about 0.1 occurrences11–11 Mya — about 0.1 occurrences11–10 Mya — about 0.1 occurrences10–9.7 Mya — about 0.1 occurrences9.7–9.3 Mya — about 0.1 occurrences9.3–8.9 Mya — about 0.1 occurrences8.9–8.5 Mya — about 0.1 occurrences8.5–8.1 Mya — about 0.1 occurrences8.1–7.7 Mya — about 0.1 occurrences7.7–7.3 Mya — about 0.1 occurrences7.3–6.9 Mya — about 0.1 occurrences6.9–6.5 Mya — about 0.1 occurrences6.5–6.1 Mya — about 0.1 occurrences6.1–5.7 Mya — about 0.1 occurrences5.7–5.3 Mya — about 0.1 occurrences5.3–4.9 Mya — about 0.1 occurrences4.9–4.4 Mya — about 0.1 occurrences4.4–4.0 Mya — about 0.1 occurrences4.0–3.6 Mya — about 0.1 occurrences3.6–3.2 Mya — about 0.0 occurrences404 ka–0 Mya — about 1 occurrence3.6 Mya129 ka12.1 Mya0 Mya

2 occurrences of Sismondia arnoldi on record, most of them in the Pleistocene. 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

2 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

2 formations

Etchegoin — 35.96°N, 120.01°WPalos Verdes Sand — 33.64°N, 117.88°W

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The named rock units Sismondia arnoldi has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Sismondia arnoldi and its relatives

Pleistocene

Where Sismondia arnoldi and its relatives were recorded in the Pleistocene.

Found in the same rock

59 taxa

The Paleobiology Database records 2 sites for Sismondia arnoldi, 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

2 references

Each of the 2 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. 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 Sismondia arnoldi

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 of Sismondia arnoldi was found in MorphoSource and Sketchfab.

Smithsonian Open Access was not reached for this taxon, so this list is what the others held rather than everything there is.

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

Keep going

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

Occurrence data from the Paleobiology Database, CC BY 4.0. Clark and Twitchell 1915