Hemiaster (Trachyaster)

No picture of Hemiaster (Trachyaster) was found. Wikipedia, Wikidata and iDigBio were searched and had none. Smithsonian Open Access did not answer, so this is what the others held rather than everything there is. GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Hemiaster (Trachyaster), or no answer at all. This entry cannot say which.

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 20 million years on record.

The record covers at least 41.03 Mya to 20.45 Mya. No occurrence read is dated outside 48.07 Mya to 15.98 Mya.

Eocene — about 1 of 2 occurrencesEoceneOligocene — about 0 of 2 occurrencesMiocene — about 1 of 2 occurrencesMiocene49–48 Mya — about 0.1 occurrences48–46 Mya — about 0.2 occurrences46–45 Mya — about 0.2 occurrences45–44 Mya — about 0.2 occurrences44–43 Mya — about 0.2 occurrences43–42 Mya — about 0.2 occurrences42–41 Mya — about 0.1 occurrences21–20 Mya — about 0.1 occurrences20–19 Mya — about 0.2 occurrences19–18 Mya — about 0.2 occurrences18–16 Mya — about 0.2 occurrences16–15 Mya — about 0.1 occurrences41.03 Mya20.45 Mya48.7 Mya15.3 Mya

2 occurrences of Hemiaster (Trachyaster) on record, most of them in the Eocene. 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

1 formation

Dammam — 25.49°N, 50.85°E

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The named rock units Hemiaster (Trachyaster) has been recovered from, largest first. Drawn where the rock is now, not where it formed. 1 occurrence has no formation on record, which is common for older literature.

Hemiaster (Trachyaster) and its relatives

Eocene

Where Hemiaster (Trachyaster) and its relatives were recorded in the Eocene.

Found in the same rock

17 taxa

The Paleobiology Database records 2 sites for Hemiaster (Trachyaster), 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 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 content0

No picture of Hemiaster (Trachyaster) was found. Wikipedia, Wikidata and iDigBio were searched and had none.

Smithsonian Open Access did not answer, so this is what the others held rather than everything there is.

GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Hemiaster (Trachyaster), or no answer at all. This entry cannot say which.

No 3D scan of Hemiaster (Trachyaster) 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 itHemiaster through timeFormations of the EoceneThe world it lived on

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