Cyrtiidae

Not Cyrtiidae. This is Macropleura Boucot, 1963, a relative — both are Cyrtiidae.
Yale Peabody Museum · CC0 · 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
- CyrtioideaPBDB
- Diet
- suspension feederPBDB, for Spiriferida
- Life habit
- epifaunalPBDB, for Spiriferida
- Motility
- stationaryPBDB, for Spiriferida
- Vision
- blindPBDB, for Rhynchonellata
- Environment
- marinePBDB, for Lophophorata
Time the record covers
At least 206 million years on record.
The record covers at least 458.2 Mya to 251.902 Mya. No occurrence read is dated outside 468 Mya to 201.4 Mya.
910 occurrences of Cyrtiidae on record, most of them in the Silurian. 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
910 occurrences- Ordovician3%
- Silurian84%
- Devonian13%
- Early Triassicunder 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. More on what this infers.
Found in
211 formations
- Motol Formation48
- Scotch Grove Formation33
- Racine Formation31
- Much Wenlock Formation21
- Rochester Shale Formation · Clinton Group20
- Canon de Caballeros Formation17
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The named rock units Cyrtiidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 187 further formations hold fewer occurrences each and are not listed. 110 occurrences have no formation on record, which is common for older literature.
Cyrtiidae and its relatives
SilurianWhere Cyrtiidae and its relatives were recorded in the Silurian.
Found in the same rock
2,152 taxa- Eospirifer90 sites
- Atrypa81 sites
- Atrypa reticularis75 sites
- Isorthis71 sites
- Cyrtia63 sites
- Favosites60 sites
- Resserella59 sites
- Howellella56 sites
- Bryozoa55 sites
- Dalejina55 sites
- Eospirifer radiatus55 sites
- Leptaena55 sites
- Crinoidea50 sites
- Gastropoda50 sites
- Gypidula48 sites
- Leptaena rhomboidalis44 sites
- Heliolites42 sites
- Rugosa42 sites
- Calymene40 sites
- Whitfieldella40 sites
- Trilobita39 sites
- Fardenia (Coolinia)38 sites
- Atrypina37 sites
- Bivalvia37 sites
The Paleobiology Database records 569 sites for Cyrtiidae, 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
154 references- Caradocian-Gedinnian echinoderm associations of Central and Eastern North America65
- Correlation of the Silurian rocks of China52
- The Clinton of Western and Central New York47
- Silurian and Lochkovian communities in the Prague basin (Barrandian area, Czech Republic)42
- Silurian Reefs of Gotland33
- Silurian field excursions: Prague Basin (Barrandian), Bohemia28
- A review of Silurian brachiopods from Gotland28
- Wenlockian fossil communities in New York State and adjacent areas: Paleontology and Paleoecology26
- Community paleoecology as a geologic tool: the Chinese Ashgillian-Eifelian (latest Ordovician through early Middle Devonian) as an example23
- Brakhiopody Pentamerida i Spiriferida silura Estonii - Siluran Brachiopods Pentamerida and Spiriferida of Estonia21
- Late Ordovician brachiopod communities of southeast China18
- Silurian and Early Devonian benthic communities of the Ural-Tien Shan region18
Each of the 910 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. 142 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 Macropleura Boucot, 1963
- Source
- GBIF
- Credit
- Yale Peabody Museum
- Licence
- CC0
- Commercial use
- the licence allows it
No 3D scan of Cyrtiidae 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 itCyrtioidea through timeFormations of the SilurianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Frederiks 1924