Sexta

Not Sexta. This is Unio tumidus Philipsson, 1788, a relative.
-919270953 · CC BY 4.0 · via GBIF. 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
- MactromyidaePBDB
- Diet
- chemosymbioticPBDB, for Lucinoidea
- Life habit
- infaunalPBDB, for Lucinoidea
- Motility
- facultatively mobilePBDB, for Lucinoidea
- Vision
- blindPBDB, for Bivalvia
Time the record covers
At most 6.6 million years on record.
Every occurrence read is dated to somewhere between 100.5 Mya and 93.9 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.
6 occurrences of Sexta on record, most of them in the Late 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
6 occurrences- Late Cretaceous100%
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
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The named rock units Sexta 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.
Sexta and its relatives
Late CretaceousWhere Sexta and its relatives were recorded in the Late Cretaceous.
Found in the same rock
76 taxa- Cymbophora4 sites
- Metengonoceras dumbli4 sites
- Parmicorbula4 sites
- Ringicula4 sites
- Anomia3 sites
- Callistina3 sites
- Dentalium3 sites
- Exogyra columbella3 sites
- Lispodesthes3 sites
- Sinonia3 sites
- Yoldia3 sites
- Acmaea2 sites
- Anchura2 sites
- Breviarca2 sites
- Carota2 sites
- Cyprimeria2 sites
- Euspira2 sites
- Fictoacteon2 sites
- Glossus2 sites
- Legumen2 sites
- Liopistha (Psilomya)2 sites
- Modiolus alveolana2 sites
- Opertochasma2 sites
- Ostrea soleniscus2 sites
The Paleobiology Database records 6 sites for Sexta, 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
2 references- Larger invertebrate fossils of the Woodbine formation (Cenomanian) of Texas5
- Diversity and Species Abundance Patterns in Late Cenomanian Black Shale Biofacies, Western Interior, U.S.1
Each of the 6 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. Each entry links to doi.org. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.
Media and terms
Media content2

Picture of Unio tumidus Philipsson, 1788
- Source
- GBIF
- Credit
- -919270953
- Licence
- CC BY 4.0
- Commercial use
- the licence allows it
CT scan
- Source
- MorphoSource
- Licence
- not stated by the source
- Commercial use
- cannot be read from the licence given — check the record
- Specimen
- Manduca sexta · L-AYK
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 itMactromyidae through timeFormations of the Late CretaceousThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Stephenson 1953