Hemiaster californicus

Hemiaster californicus

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
HemiasterPBDB
Diet
deposit feeder, detritivorePBDB, for Spatangoida
Life habit
shallow infaunalPBDB, for Spatangoida
Motility
slow-movingPBDB, for Spatangoida
Vision
limitedPBDB, for Echinoidea
Environment
marinePBDB, for Spatangoida

Time the record covers

At most 11 million years on record.

Every occurrence read is dated to somewhere between 93.9 Mya and 83.6 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Late Cretaceous — about 4 of 4 occurrencesLate Cretaceous94–94 Mya — about 0.2 occurrences94–93 Mya — about 0.3 occurrences93–93 Mya — about 0.3 occurrences93–93 Mya — about 0.3 occurrences93–92 Mya — about 0.3 occurrences92–92 Mya — about 0.3 occurrences92–91 Mya — about 0.3 occurrences91–91 Mya — about 0.3 occurrences91–91 Mya — about 0.3 occurrences91–90 Mya — about 0.3 occurrences90–90 Mya — about 0.3 occurrences90–90 Mya — about 0.1 occurrences90–89 Mya — about 0.0 occurrences89–89 Mya — about 0.0 occurrences89–88 Mya — about 0.0 occurrences88–88 Mya — about 0.0 occurrences88–88 Mya — about 0.0 occurrences88–87 Mya — about 0.0 occurrences87–87 Mya — about 0.0 occurrences87–86 Mya — about 0.0 occurrences86–86 Mya — about 0.0 occurrences86–86 Mya — about 0.0 occurrences86–85 Mya — about 0.0 occurrences85–85 Mya — about 0.0 occurrences85–85 Mya — about 0.0 occurrences85–84 Mya — about 0.0 occurrences84–84 Mya — about 0.0 occurrences84–83 Mya — about 0.0 occurrences94.4 Mya83.1 Mya

4 occurrences of Hemiaster californicus on record, most of them in the Late Cretaceous. 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

4 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

Ladd — 33.75°N, 117.68°WRedding — 40.59°N, 122.39°W

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

Hemiaster californicus and its relatives

Late Cretaceous

Where Hemiaster californicus and its relatives were recorded in the Late Cretaceous.

Found in the same rock

16 taxa

The Paleobiology Database records 4 sites for Hemiaster californicus, and this reads all of them. The number is how many of those sites it was catalogued from too.

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 4 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 Hemiaster californicus

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 itHemiaster through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Clark 1891