Polydiadema

Polydiadema

via iDigBio · CC BY · 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
PseudodiadematidaePBDB
Diet
grazer, deposit feederPBDB, for Echinoidea
Life habit
epifaunalPBDB, for Echinoidea
Motility
actively mobilePBDB, for Echinoidea
Vision
limitedPBDB, for Echinoidea
Environment
marinePBDB, for Echinodermata

Time the record covers

At least 67 million years on record.

The record covers at least 168.2 Mya to 100.5 Mya. No occurrence read is dated outside 168.6 Mya to 93.9 Mya.

Middle Jurassic — about 2 of 42 occurrencesMiddle JurassicLate Jurassic — about 3 of 42 occurrencesLate JurassicEarly Cretaceous — about 16 of 42 occurrencesEarly CretaceousLate Cretaceous — about 21 of 42 occurrencesLate Cretaceous170–168 Mya — about 1 occurrence168–165 Mya — about 0.1 occurrences165–162 Mya — about 0.7 occurrences162–160 Mya — about 0.2 occurrences160–157 Mya — about 2 occurrences157–155 Mya — about 0.8 occurrences139–136 Mya — about 0.7 occurrences136–134 Mya — about 3 occurrences134–131 Mya — about 2 occurrences131–129 Mya — about 0.4 occurrences129–126 Mya — about 0.4 occurrences126–123 Mya — about 0.0 occurrences123–121 Mya — about 0.1 occurrences121–118 Mya — about 0.3 occurrences118–116 Mya — about 0.3 occurrences116–113 Mya — about 0.3 occurrences113–111 Mya — about 0.4 occurrences111–108 Mya — about 2 occurrences108–105 Mya — about 2 occurrences105–103 Mya — about 2 occurrences103–100 Mya — about 3 occurrences100–98 Mya — about 8 occurrences98–95 Mya — about 8 occurrences95–92 Mya — about 3 occurrences168.2 Mya100.5 Mya170 Mya92 Mya

42 occurrences of Polydiadema on record. 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

42 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

13 formations

Grès verts helvétiques — 46.10°N, 6.82°EGrès verts helvétiques — 45.98°N, 6.78°EGrès verts helvétiques — 45.99°N, 6.58°EGrizzle — 50.80°N, 0.18°EWilmington Sands — 50.80°N, 0.18°EPerte-du-Rhone — 45.15°N, 5.48°EMonk’s Bay Sandstone — 50.60°N, 1.32°WHumeralis Schichten — 47.47°N, 7.37°EEffinger Schichten — 47.26°N, 7.52°EUpper Greensand — 50.80°N, 0.18°ESecond niveau de Calcaires à Rudistes — 45.95°N, 1.08°WMarno-calcaires à Heteraster oblongus — 38.85°N, 9.33°WCraie glauconieuse — 48.84°N, 0.13°EAmbarimaninga — 16.50°S, 46.00°ETheoi Marls — 46.40°N, 0.06°W

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The named rock units Polydiadema has been recovered from, largest first. Drawn where the rock is now, not where it formed. 19 occurrences have no formation on record, which is common for older literature.

Found in the same rock

523 taxa

The Paleobiology Database records 40 sites for Polydiadema, 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

16 references

Each of the 42 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. 4 further references are not listed. 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 Polydiadema

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

No 3D scan of Polydiadema was found in Sketchfab.

Smithsonian Open Access and MorphoSource were 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 itPseudodiadematidae through timeThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.