Modiomorphida
Modiomorphida is an extinct order of fossil saltwater clams, marine bivalve molluscs.

Fossiladder13 · CC BY-SA 4.0 · via Wikipedia/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
- CardiiformiiPBDB
- Diet
- suspension feederPBDB
- Life habit
- semi-infaunalPBDB
- Motility
- stationary, attachedPBDB
- Vision
- blindPBDB, for Bivalvia
Time the record covers
At least 271 million years on record.
The record covers at least 477.1 Mya to 205.7 Mya. No occurrence read is dated outside 486.85 Mya to 174.7 Mya.
1,922 occurrences of Modiomorphida on record, most of them in the Devonian. The Paleobiology Database records this as a living group, and the chart stops with its fossils rather than at the present. 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
1,922 occurrences- Ordovician36%
- Silurian14%
- Devonian41%
- Carboniferous4%
- Permian2%
- Middle Triassicunder 1%
- Late Triassic2%
- Early Jurassicunder 1%
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
400 formations
- Moscow Formation · Hamilton Group131
- Ludlowville Formation · Hamilton Group95
- Skaneateles Formation · Hamilton Group86
- Geneseo Formation · Genesee Group64
- Waynesville Formation · Richmond Group59
- Dunleith Formation · Galena Group44
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The named rock units Modiomorphida has been recovered from, largest first. Drawn where the rock is now, not where it formed. 376 further formations hold fewer occurrences each and are not listed. 143 occurrences have no formation on record, which is common for older literature.
Modiomorphida and its relatives
DevonianWhere Modiomorphida and its relatives were recorded in the Devonian.
Found in the same rock
2,076 taxa- Modiolopsis89 sites
- Nuculites57 sites
- Cypricardinia47 sites
- Crinoidea46 sites
- Lingula44 sites
- Pterinea43 sites
- Tentaculites42 sites
- Ctenodonta39 sites
- Fenestella35 sites
- Camarotoechia34 sites
- Leptaena34 sites
- Schuchertella34 sites
- Ambonychia33 sites
- Flexicalymene33 sites
- Rafinesquina32 sites
- Bryozoa29 sites
- Dielasma29 sites
- Hallopora29 sites
- Onniella29 sites
- Cornulites27 sites
- Isotelus27 sites
- Orbiculoidea27 sites
- Ostracoda27 sites
- Craniops26 sites
The Paleobiology Database records 1,237 sites for Modiomorphida, 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
324 references- Stratigraphic ranges of Middle and Late Ordovician Gastropoda and Monoplacophora of Minnesota118
- Gradient ecology of a biotic invasion: biofacies of the type Cincinnatian Series (Upper Ordovician), Cincinnati, Ohio region, USA91
- The classification and distribution of the Hamilton and Chemung series of central and eastern New York70
- Relative taxonomic and ecological stability in Devonian marine faunas of New York State: a test of coordinated stasis57
- Quantitative Analysis of Paleocommunities in the Lower Part of the Hamilton Group near Cazenovia, New York46
- Upper Ordovician faunas of Ontario and Quebec44
- The fossil fauna of the Ordovician in the Cincinnati Region43
- Work with Thayer collections, Yale Peabody Accession 7112, published, in part, "New perspectives on transitions between ecological-evolutionary subunits in the "type interval" for coordinated stasis", James J Zambito IV, Carlton E Brett, Gordon C Baird, Sarah E Kolbe, Arnold I Miller; Paleobiology40
- Quantitative community analysis: Recurrent group and cluster techniques applied to the fauna of the Upper Devonian Sonyea Group, New York38
- Redefinition, Stratigraphy and Depostional Environments of the Mottville Member (Hamilton Group) in Central and Eastern New York32
- Classification and distribution of the Hamilton and Chemung series of central and eastern New York, Part 230
- Stratigraphy and Paleontology of the Jaycox Shale Member, Hamilton Group of the Finger Lakes Region of New York State28
Each of the 1,922 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. 312 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 Modiomorphida
- Source
- Wikipedia/Commons
- Credit
- Fossiladder13
- Licence
- CC BY-SA 4.0
- Commercial use
- the licence allows it
No 3D scan of Modiomorphida 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.
The description on this site
- Licence
- CC BY-SA 4.0
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itCardiiformii through timeFormations of the DevonianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Newell 1969