Quadrans
via iDigBio · CC BY-NC-ND · 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
- TellininaePBDB
- Diet
- deposit feederPBDB, for Tellinidae
- Life habit
- infaunalPBDB, for Tellinidae
- Motility
- facultatively mobilePBDB, for Tellinidae
- Vision
- blindPBDB, for Bivalvia
Time the record covers
At least 68 million years on record.
The record covers at least 72.2 Mya to 3.6 Mya. No occurrence read is dated outside 83.6 Mya to 11.7 ka.
4 occurrences of Quadrans on record, most of them in the Late Cretaceous. The Paleobiology Database records this as a living group. 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
4 occurrences- Late Cretaceous50%
- Pliocene38%
- Pleistocene12%
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
3 formations
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The named rock units Quadrans has been recovered from, largest first. Drawn where the rock is now, not where it formed.
Quadrans and its relatives
Late CretaceousWhere Quadrans and its relatives were recorded in the Late Cretaceous.
Found in the same rock
99 taxa- Anomia2 sites
- Biplica obliqua2 sites
- Calva (Egelicalva) bowersiana2 sites
- Corbula2 sites
- Cymbophora stantoni2 sites
- Cymbophora triangulata2 sites
- Dentalium2 sites
- Euspira2 sites
- Glycymeris (Glycymerita) anae2 sites
- Inoceramidae2 sites
- Isognomon2 sites
- Jupiteria2 sites
- Lispodesthes rotundatus2 sites
- Meekia (Mygallia) bella2 sites
- Meekia (Mygallia) daileyi2 sites
- Nonacteonina obesa2 sites
- Perissitys pacifica2 sites
- Pterotrigonia evansana2 sites
- Tellina2 sites
- Trinacria cor2 sites
- Volutoderma averillii2 sites
- Acila (Truncacila) demessa1 site
- Acteonidae1 site
- Alaba1 site
The Paleobiology Database records 3 sites for Quadrans, 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- Checklist of Mesozoic macrofossil localities in the Santa Cruz Mountains and vicinity2
- Pliocene-Pleistocene coastal events and history along the western margin of Australia1
- Preliminary notes on fossil records of East Malaysia and Brunei1
Each of the 4 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 Quadrans
- Source
- iDigBio
- Credit
- via iDigBio
- Licence
- CC BY-NC-ND
- Commercial use
- the licence does not allow it
No 3D scan of Quadrans 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 itTellininae through timeFormations of the Late CretaceousThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. (Bertin 1878)