Acharax

Graham Oliver, Clara F. Rodrigues, Marina R. Cunha · CC BY 3.0 · via Wikidata/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
- SolemyinaePBDB
- Diet
- deposit feeder, chemosymbioticPBDB, for Solemyidae
- Life habit
- infaunalPBDB, for Solemyidae
- Motility
- facultatively mobilePBDB, for Solemyidae
- Vision
- blindPBDB, for Bivalvia
- Environment
- lagoonal,coastal,inner shelf,outer shelf,oceanicPBDB, for Solemyidae
Time the record covers
At least 393 million years on record.
The record covers at least 393.47 Mya to 129 ka. No occurrence read is dated outside 419.62 Mya to 11.7 ka.
144 occurrences of Acharax on record, most of them in the Oligocene. 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
144 occurrences- Devonian5%
- Carboniferous20%
- Permian18%
- Late Jurassic1%
- Early Cretaceous4%
- Late Cretaceousunder 1%
- Eocene8%
- Oligocene22%
- Miocene14%
- Pliocene5%
- Pleistocene1%
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
74 formations
- Cabaniss Formation · Cherokee Group9
- Ford Formation6
- Lincoln Creek Formation6
- Blakeley Formation5
- Twin River Formation5
- Pysht Formation · Twin River Group4
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The named rock units Acharax has been recovered from, largest first. Drawn where the rock is now, not where it formed. 50 further formations hold fewer occurrences each and are not listed. 15 occurrences have no formation on record, which is common for older literature.
Acharax and its relatives
OligoceneWhere Acharax and its relatives were recorded in the Oligocene.
Found in the same rock
1,578 taxa- Conchocele bisecta19 sites
- Solemya (Acharax) dalli19 sites
- Acila (Acila) gettysburgensis12 sites
- Derbyia crassa10 sites
- Crinoidea9 sites
- Cymatospira montfortianus9 sites
- Desmoinesia muricatina9 sites
- Liracassis apta9 sites
- Macoma (Macoma) twinensis9 sites
- Neospirifer cameratus9 sites
- Nuculana9 sites
- Orbiculoidea missouriensis9 sites
- Parajuresania nebrascensis9 sites
- Pharkidonotus percarinatus9 sites
- Wilkingia terminale9 sites
- Bakevellia (Bakevellia) ceratophaga8 sites
- Lingula carbonaria8 sites
- Lucina8 sites
- Lucinoma acutilineata8 sites
- Nuculopsis girtyi8 sites
- Orbiculoidea8 sites
- Parallelodon8 sites
- Schizodus8 sites
- Yoldia8 sites
The Paleobiology Database records 119 sites for Acharax, 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
72 references- Desmoinesian Brachiopoda and Mollusca from southwest Missouri11
- Megafaunal zones of the Oligocene of northwestern Washington11
- Neogene and Paleogene Molluscan (Bivalvia) Cenozones of the Russian Northeast.9
- Mollusks from late Mesozoic seep deposits, chiefly in California5
- Bivalves from the Changhsingian (upper Permian) Bellerophon Formation of the Dolomites (Italy): ancestors of Lower Triassic post-extinction benthic communities4
- Chemosynthetic bivalves of the family Solemyidae (bivalvia, protobranchia) in the Neogene of the Mediterranean Basin4
- Neogene and Paleogene Molluscan (Bivalvia) Cenozones of Sakhalin and Kurile Islands4
- A comprehensive approach to the study of methane-seep deposits from the Lincoln Creek Formation, western Washington State, USA4
- Bivalves (Mollusca) na Formacao Ponta Grossa (Bacia do Parana - Devoniano). Revisao Sistematica3
- Kalashnikov et al., 19813
- The Permian Bivalvia of northern England3
- The fauna of the Ames and Brush Creek shales of the Conemaugh Formation of western Maryland3
Each of the 144 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. 60 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 Acharax
- Source
- Wikidata/Commons
- Credit
- Graham Oliver, Clara F. Rodrigues, Marina R. Cunha
- Licence
- CC BY 3.0
- Commercial use
- the licence allows it
No 3D scan of Acharax 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 itSolemyinae through timeFormations of the OligoceneThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. (Dall 1908)