Hirudocidaris

Hirudocidaris

via iDigBio · CC0 · 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
CidaroidaPBDB
Diet
grazer, omnivorePBDB, for Cidaroida
Life habit
low-level epifaunalPBDB, for Cidaroida
Motility
slow-movingPBDB, for Cidaroida
Vision
limitedPBDB, for Echinoidea
Environment
marinePBDB, for Cidaroida

Time the record covers

At least 27 million years on record.

The record covers at least 113.2 Mya to 85.7 Mya. No occurrence read is dated outside 125.77 Mya to 66 Mya.

Early Cretaceous — about 4 of 7 occurrencesEarly CretaceousLate Cretaceous — about 3 of 7 occurrencesLate CretaceousPaleocene — about 0 of 7 occurrences127–125 Mya — about 0.3 occurrences125–123 Mya — about 0.7 occurrences123–121 Mya — about 0.7 occurrences121–119 Mya — about 0.7 occurrences119–117 Mya — about 0.7 occurrences117–115 Mya — about 0.7 occurrences115–112 Mya — about 0.4 occurrences102–100 Mya — about 0.0 occurrences100–98 Mya — about 0.1 occurrences98–96 Mya — about 0.1 occurrences96–94 Mya — about 0.1 occurrences94–92 Mya — about 0.1 occurrences92–90 Mya — about 0.1 occurrences90–88 Mya — about 0.1 occurrences88–86 Mya — about 0.2 occurrences86–83 Mya — about 1 occurrence83–81 Mya — about 0.1 occurrences81–79 Mya — about 0.1 occurrences79–77 Mya — about 0.1 occurrences77–75 Mya — about 0.1 occurrences75–73 Mya — about 0.1 occurrences73–71 Mya — about 0.1 occurrences71–69 Mya — about 0.1 occurrences69–67 Mya — about 0.1 occurrences67–65 Mya — about 0.1 occurrences113.2 Mya85.7 Mya127 Mya65 Mya

7 occurrences of Hirudocidaris on record, most of them in the Early 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

7 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

Holywell Nodular Chalk — 50.69°N, 3.12°WHolywell Nodular Chalk — 50.75°N, 2.95°WOlazagutia — 42.88°N, 2.20°W

Loading coastlines…

The named rock units Hirudocidaris has been recovered from, largest first. Drawn where the rock is now, not where it formed. 4 occurrences have no formation on record, which is common for older literature.

Hirudocidaris and its relatives

Early Cretaceous

Where Hirudocidaris and its relatives were recorded in the Early Cretaceous.

Found in the same rock

31 taxa

The Paleobiology Database records 7 sites for Hirudocidaris, 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

3 references

Each of the 7 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 Hirudocidaris

Source
iDigBio
Credit
via iDigBio
Licence
CC0
Commercial use
the licence allows it

No 3D scan of Hirudocidaris 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 itCidaroida through timeFormations of the Early CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.