Strophomenida
Strophomenida is an extinct order of articulate brachiopods which lived from the lower Ordovician period to the mid Carboniferous period. Strophomenida is part of the extinct class Strophomenata, and was the largest known order of brachiopods, encompassing over 400 genera. Some of the largest and heaviest known brachiopod species belong to this class. Strophomenids were among the most diverse and abundant brachiopods during the Ordovician, but their diversity was strongly impacted at the Late Ordovician mass extinction. Survivors rediversified into new morphologies in the Silurian, only to be impacted once again at the Late Devonian mass extinction.
Wilson44691 · Public Domain · 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
- StrophomenataPBDB
- Diet
- suspension feederPBDB
- Life habit
- epifaunalPBDB
- Motility
- stationaryPBDB
- Vision
- blindPBDB, for Strophomenata
- Environment
- marinePBDB, for Lophophorata
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 488.9 Mya to 201.4 Mya.
12,000+ occurrences of Strophomenida on record. 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
12,000 occurrences read- Cambrianunder 1%
- Ordovician51%
- Silurian24%
- Devonian24%
- Carboniferous1%
- Permianunder 1%
- Middle Triassicunder 1%
- Late Triassicunder 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. The read hit its cap, so every figure above is a floor and the shares are of the occurrences read. More on what this infers.
Found in
at least 1056 formations
- Vaureal Formation262
- Martinsburg Formation236
- Waynesville Formation · Richmondian Group208
- Jupiter Formation · Anticosti Group197
- Ludlowville Formation · Hamilton Group195
- Anderken Formation159
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The named rock units Strophomenida has been recovered from, largest first. Drawn where the rock is now, not where it formed. The read hit its cap, so each count is a floor. 1,032 further formations hold fewer occurrences each and are not listed. 1,627 occurrences have no formation on record, which is common for older literature.
Found in the same rock
1,746 taxa- Crinoidea75 sites
- Leptaena69 sites
- Rafinesquina54 sites
- Strophomena54 sites
- Hallopora50 sites
- Atrypa45 sites
- Platystrophia44 sites
- Isotelus43 sites
- Lingula42 sites
- Zygospira40 sites
- Sowerbyella39 sites
- Ostracoda37 sites
- Trepostomata37 sites
- Flexicalymene35 sites
- Schuchertella35 sites
- Tentaculites35 sites
- Pterinea34 sites
- Rugosa34 sites
- Ctenodonta32 sites
- Nuculites32 sites
- Isorthis31 sites
- Hebertella30 sites
- Modiolopsis30 sites
- Archaeogastropoda29 sites
The Paleobiology Database records at least 848 sites for Strophomenida, 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
at least 742 references- Gradient ecology of a biotic invasion: biofacies of the type Cincinnatian Series (Upper Ordovician), Cincinnati, Ohio region, USA837
- Late Ordovician and Early Silurian strophomenid brachiopods of Anticosti Island, Quebec, Canada603
- Early Llandovery brachiopods of Wales465
- Using GIS to unlock the interactions between biogeography, environment, and evolution in middle and Late Devonian brachiopods and bivalves311
- The Clinton of Western and Central New York210
- Stratigraphy of the Lower Middle Ordovician of Tazewell County, Virginia209
- Palaeozoic geology of the Lake Simcoe Area, Ontario204
- Upper Ordovician brachiopods from the Anderken Formation, Kazakhstan: their ecology and systematics159
- GIS-based biogeography of Cincinnatian (Upper Ordovician) brachiopods with special reference to Hebertella158
- Ecological restructuring after extinction: the Late Ordovician (Mohawkian) of the eastern United States142
- Community gradients in the Martinsburg Fm. (Ord.) southwestern Virginia135
- Zonation of the Middle and Upper Ordovician strata in northwestern Georgia135
Each of the 12,000 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. That read hit its cap, so each count is a floor. 730 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 Strophomenida
- Source
- Wikipedia/Commons
- Credit
- Wilson44691
- Licence
- Public Domain
- Commercial use
- the licence allows it
No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.
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 itStrophomenata through timeThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Opik 1934