Hemiaster (Bolbaster)

Hemiaster prunella (Lamarck, 1816), a relative of Hemiaster (Bolbaster) — not Hemiaster (Bolbaster) itself

Not Hemiaster (Bolbaster). This is Hemiaster prunella (Lamarck, 1816), a relative — both are Hemiasteridae.

via GBIF · CC BY 4.0 · via GBIF. 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 least 67 million years on record.

The record covers at least 83.6 Mya to 15.98 Mya. No occurrence read is dated outside 100.5 Mya to 11.63 Mya.

Early Cretaceous — about 0 of 34 occurrencesLate Cretaceous — about 24 of 34 occurrencesLate CretaceousPaleocene — about 1 of 34 occurrencesPaleoceneEocene — about 1 of 34 occurrencesEoceneOligocene — about 3 of 34 occurrencesOligoceneMiocene — about 5 of 34 occurrencesMiocene102–99 Mya — about 0.0 occurrences99–96 Mya — about 0.1 occurrences96–93 Mya — about 0.1 occurrences93–90 Mya — about 0.1 occurrences90–87 Mya — about 0.1 occurrences87–84 Mya — about 3 occurrences84–81 Mya — about 0.9 occurrences81–78 Mya — about 0.6 occurrences78–75 Mya — about 0.6 occurrences75–71 Mya — about 3 occurrences71–68 Mya — about 9 occurrences68–65 Mya — about 7 occurrences65–62 Mya — about 0.9 occurrences62–59 Mya — about 0.2 occurrences59–56 Mya — about 0.1 occurrences56–53 Mya — about 0.0 occurrences50–47 Mya — about 0.1 occurrences47–44 Mya — about 0.2 occurrences44–41 Mya — about 0.2 occurrences41–38 Mya — about 0.2 occurrences38–34 Mya — about 0.2 occurrences34–31 Mya — about 0.8 occurrences31–28 Mya — about 0.9 occurrences28–25 Mya — about 0.8 occurrences25–22 Mya — about 0.7 occurrences22–19 Mya — about 0.7 occurrences19–16 Mya — about 0.7 occurrences16–13 Mya — about 3 occurrences13–9.9 Mya — about 0.7 occurrences83.6 Mya15.98 Mya102 Mya10 Mya

34 occurrences of Hemiaster (Bolbaster) 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

34 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

14 formations

Maastricht — 50.85°N, 5.70°EMaastricht — 50.85°N, 6.77°EMaastricht — 50.86°N, 5.79°ECabo de Lata — 43.49°N, 3.79°WCabo de Lata — 42.84°N, 2.18°WGulpen — 50.80°N, 5.67°EGambier Limestone — 37.82°S, 140.64°EGambier Limestone — 37.93°S, 140.73°EPort Willunga — 35.28°S, 138.48°EPort Willunga — 35.18°S, 138.47°EGulpen — 50.85°N, 5.70°ECampanien 1-2 — 45.75°N, 0.47°WArén — 42.17°N, 0.90°EOlazagutia — 42.88°N, 2.20°WGlenforslan — 34.29°S, 139.63°ETortachilla Limestone — 35.28°S, 138.48°EPuebla — 38.32°S, 144.32°EMorgan Limestone — 37.75°S, 146.98°EPort Campbell Limestone — 38.62°S, 142.98°E

Loading coastlines…

The named rock units Hemiaster (Bolbaster) has been recovered from, largest first. Drawn where the rock is now, not where it formed. 5 occurrences have no formation on record, which is common for older literature.

Hemiaster (Bolbaster) and its relatives

Late Cretaceous

Where Hemiaster (Bolbaster) and its relatives were recorded in the Late Cretaceous.

Found in the same rock

223 taxa

The Paleobiology Database records 30 sites for Hemiaster (Bolbaster), 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

12 references

Each of the 34 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 prunella (Lamarck, 1816)

Source
GBIF
Credit
via GBIF
Licence
CC BY 4.0
Commercial use
the licence allows it

No 3D scan of Hemiaster (Bolbaster) was found in Smithsonian Open Access and Sketchfab.

MorphoSource 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 itHemiaster through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Pomel 1869)