Acila (Truncacila) decisa

via GBIF · 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
- Acila (Truncacila)PBDB
- Diet
- deposit feeder, suspension feederPBDB, for Nuculidae
- Life habit
- infaunalPBDB, for Nuculidae
- Motility
- facultatively mobilePBDB, for Nuculidae
- Vision
- blindPBDB, for Bivalvia
- Environment
- coastal,inner shelf,outer shelf,oceanicPBDB, for Nuculidae
Time the record covers
At least 25 million years on record.
The record covers at least 59.24 Mya to 33.9 Mya. No occurrence read is dated outside 66 Mya to 27.3 Mya.
60 occurrences of Acila (Truncacila) decisa on record, most of them in the Eocene. 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
60 occurrencesThese 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
27 formations
- Martinez Formation10
- Santa Susana Formation6
- Roseburg Formation · Umpqua Group5
- Juncal Formation3
- Lodo Formation3
- Capay Formation3
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The named rock units Acila (Truncacila) decisa has been recovered from, largest first. Drawn where the rock is now, not where it formed. 3 further formations hold fewer occurrences each and are not listed. 6 occurrences have no formation on record, which is common for older literature.
Acila (Truncacila) decisa and its relatives
EoceneWhere Acila (Truncacila) decisa and its relatives were recorded in the Eocene.
Found in the same rock
550 taxa- Nemocardium (Nemocardium) linteum19 sites
- Calyptraea diegoana16 sites
- Cylichnina tantilla14 sites
- Nuculana (Saccella) gabbii14 sites
- Scaphander (Mirascapha) costatus13 sites
- Brachidontes (Brachidontes) cowlitzensis12 sites
- Ficopsis remondii11 sites
- Turritella buwaldana11 sites
- Cucullaea mathewsonii10 sites
- Caryocorbula parilis9 sites
- Glycymeris (Glycymerita) sagittata9 sites
- Polinices (Euspira) nuciformis9 sites
- Pachycrommium clarki8 sites
- Dentalium7 sites
- Dentalium cooperi7 sites
- Ectinochilus (Macilentos) macilentus7 sites
- Ostrea7 sites
- Polinices hornii7 sites
- Sinum obliquum7 sites
- Tejonia moragai7 sites
- Turritella infragranulata pachecoensis7 sites
- Ancilla (Spirancilla) gabbi6 sites
- Eocernina hannibali6 sites
- Gari (Gobraeus) hornii6 sites
The Paleobiology Database records 56 sites for Acila (Truncacila) decisa, 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
24 references- Nuculid bivalves of the genus Acila9
- Stratigraphy and Mollusca of the Eocene of western Oregon8
- Eocene megafossils from the Needles-Gray Wolf lithic assemblage of the Easter "Core Rocks", Olympic Peninsula, Washington5
- Geology of the coast ranges immediately north of the San Francisco Bay region, California5
- Stratigraphy and fauna of the Tejon Eocene of California4
- Neogene and Paleogene Molluscan (Bivalvia) Cenozones of the Russian Northeast.3
- Geologic Map and Database of the Roseburg 30 x 60' Quadrangle, Douglas and Coos Counties, Oregon3
- Upper Paleocene to Lower Eocene ("Meganos Stage") Marine Megafossils in the Uppermost Santa Susana Formation, Simi Valley, Southern California3
- Eocene Macropaleontology of Northern Lockwood Valley, Ventura County, California3
- Macropaleontology of the Eocene Crescent Formation in the Little River Area, Southern Olympic Peninsula, Washington2
- Geology and coal resources of the Cumberland. Hobart, and Maple Valley Quadrangles, King County, Washington2
- Cenozoic Marine Formations of Washington and Oregon: an annotated catalogue1
Each of the 60 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. 12 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 Acila (Truncacila) decisa
- Source
- GBIF
- Credit
- via GBIF
- Licence
- CC BY 4.0
- Commercial use
- the licence allows it
No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itAcila (Truncacila) through timeFormations of the EoceneThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. (Conrad 1855)