Entolium
Searched as Entolium discites microtis. The Paleobiology Database treats Entolium as the accepted name.

via iDigBio · CC0 · 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
- EntoliidaePBDB
- Diet
- suspension feederPBDB
- Life habit
- epifaunalPBDB
- Motility
- facultatively mobilePBDB
- Vision
- limitedPBDB, for Entoliidae
- Environment
- marinePBDB, for Pectinida
Time the record covers
At least 3.3 million years on record.
The record covers at least 251.902 Mya to 248.6 Mya. No occurrence read is dated outside 254.14 Mya to 247 Mya.
13 occurrences of Entolium on record, most of them in the Early Triassic. 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
13 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
7 formations
- Werfen Formation · Costabella Group3
- Yingshuiquan Formation3
- Xiahuancang Formation2
- Beisi Formation2
- Tan Lac Formation1
- Huangzhishan Formation1
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The named rock units Entolium has been recovered from, largest first. Drawn where the rock is now, not where it formed.
Entolium and its relatives
Early TriassicWhere Entolium and its relatives were recorded in the Early Triassic.
Found in the same rock
1,251 taxa- Camptonectes91 sites
- Isognomon82 sites
- Astarte78 sites
- Ammonoidea77 sites
- Pleuromya65 sites
- Pleuromya uniformis65 sites
- Belemnitida62 sites
- Plagiostoma62 sites
- Buchia mosquensis60 sites
- Pinna60 sites
- Taimyrothyris58 sites
- Grammatodon52 sites
- Isocyprina48 sites
- Protocardia striatula47 sites
- Serpula intestinalis45 sites
- Modiolus44 sites
- Liostrea41 sites
- Hartwellia39 sites
- Oxytoma inequivalvis36 sites
- Pseudomelania32 sites
- Pholadomya31 sites
- Grammatodon (Cosmetodon) keyserlingii29 sites
- Serpula29 sites
- Thracia depressa29 sites
The Paleobiology Database records 1,175 sites for Entolium, and this reads 240 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
8 references- Some late Palaeozoic and Triassic bivalves from Xizang3
- Early Triassic bivalve assemblage of western Guangxi2
- New biostratigraphical data on uppermost Werfen Formation of western Dolomites (Trento, Italy)2
- Lower Triassic, Xihuancang Formation, Jianghe Formation, Yangkang Formation2
- New ophiuroids from the Permian/Triassic boundary beds of South China1
- The Triassic of Indochina Peninsula and its interregional correlation1
- The lower Triassic sequences of the Dolomites (Italy) and transdanubian mid-mountains (Hungary) and their correlation1
- Yang et al., 19871
Each of the 13 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 content2

Picture of Entolium
- Source
- iDigBio
- Credit
- via iDigBio
- Licence
- CC0
- 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
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 itEntoliidae through timeFormations of the Early TriassicThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. (Meek 1865)