Requienia

Requienia is an extinct genus of fossil saltwater clam, a marine bivalve molluscs in the order Hippuritida, family Requieniidae. These rudists lived in the Cretaceous period, from the Valanginian age (136.4–140.2) to the Campanian age. They were stationary intermediate-level suspension feeders.

Requienia

Hectonichus · CC BY-SA 3.0 · via Wikipedia/Commons. 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
RequieniinaePBDB
Diet
suspension feederPBDB, for Hippuritida
Life habit
intermediate-level epifaunal, gregariousPBDB, for Hippuritida
Motility
stationary, attachedPBDB, for Hippuritida
Vision
blindPBDB, for Bivalvia
Environment
marinePBDB, for Hippuritida

Time the record covers

At least 70 million years on record.

The record covers at least 143.1 Mya to 72.2 Mya. No occurrence read is dated outside 154.8 Mya to 66 Mya.

Late Jurassic — about 1 of 34 occurrencesLate JurassicEarly Cretaceous — about 28 of 34 occurrencesEarly CretaceousLate Cretaceous — about 5 of 34 occurrencesLate CretaceousPaleocene — about 0 of 34 occurrences157–153 Mya — about 0.1 occurrences153–150 Mya — about 0.3 occurrences150–147 Mya — about 0.3 occurrences147–144 Mya — about 0.3 occurrences144–141 Mya — about 0.1 occurrences138–135 Mya — about 0.5 occurrences135–132 Mya — about 0.8 occurrences132–129 Mya — about 1 occurrence129–126 Mya — about 1 occurrence126–123 Mya — about 4 occurrences123–120 Mya — about 9 occurrences120–117 Mya — about 3 occurrences117–113 Mya — about 3 occurrences113–110 Mya — about 2 occurrences110–107 Mya — about 0.7 occurrences107–104 Mya — about 1 occurrence104–101 Mya — about 2 occurrences101–98 Mya — about 0.6 occurrences98–95 Mya — about 0.3 occurrences95–92 Mya — about 0.8 occurrences92–89 Mya — about 1 occurrence89–86 Mya — about 1 occurrence86–83 Mya — about 0.0 occurrences73–70 Mya — about 0.3 occurrences70–67 Mya — about 0.5 occurrences67–64 Mya — about 0.2 occurrences143.1 Mya72.2 Mya157 Mya64 Mya

34 occurrences of Requienia 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

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

13 formations

Trieste Karst Limestone — 45.75°N, 13.63°ESchrattenkalk — 47.43°N, 10.23°EAqra Limestone — 36.78°N, 43.92°EAl Hassanat — 23.53°N, 57.93°ECengellidere — 41.18°N, 31.47°E"Kanfanar" — 45.12°N, 13.83°EEl Abra — 21.32°N, 99.13°WSierra Madre — 16.77°N, 93.37°WVillarroya — 40.52°N, 0.17°EUrgonien blanc — 46.40°N, 5.80°ECalcaires à Rudistes de Praia dos Coxos — 38.85°N, 9.33°WZirc Limestone — 47.27°N, 17.87°EValea Minusului — 45.02°N, 21.88°E

Loading coastlines…

The named rock units Requienia has been recovered from, largest first. Drawn where the rock is now, not where it formed. 18 occurrences have no formation on record, which is common for older literature.

Requienia and its relatives

Early Cretaceous

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

Found in the same rock

324 taxa

The Paleobiology Database records 27 sites for Requienia, 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

23 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. 11 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 content2

Picture of Requienia

Credit
Hectonichus
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

3D model

Source
Sketchfab
Licence
CC Attribution
Commercial use
cannot be read from the licence given — check the record

The description on this site

Licence
CC BY-SA 4.0

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itRequieniinae through timeFormations of the Early CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Matheron 1842