Isorthis

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
- IsorthinaePBDB
- Diet
- suspension feederPBDB, for Dalmanellidae
- Life habit
- epifaunalPBDB, for Dalmanellidae
- Motility
- stationary, attachedPBDB, for Dalmanellidae
- Vision
- blindPBDB, for Rhynchonellata
- Environment
- marinePBDB, for Lophophorata
Time the record covers
At least 56 million years on record.
The record covers at least 449.9 Mya to 393.47 Mya. No occurrence read is dated outside 458.2 Mya to 387.95 Mya.
533 occurrences of Isorthis 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
533 occurrences- Ordovician7%
- Silurian72%
- Devonian21%
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
190 formations
- Henryhouse Formation22
- Cape Phillips Formation17
- Racine Formation13
- Canon de Caballeros Formation11
- Scotch Grove Formation10
- Paprieniai Formation9
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The named rock units Isorthis has been recovered from, largest first. Drawn where the rock is now, not where it formed. 166 further formations hold fewer occurrences each and are not listed. 84 occurrences have no formation on record, which is common for older literature.
Isorthis and its relatives
SilurianWhere Isorthis and its relatives were recorded in the Silurian.
Found in the same rock
1,886 taxa- Atrypa90 sites
- Howellella77 sites
- Dalejina69 sites
- Atrypa reticularis65 sites
- Leptaena63 sites
- Bryozoa59 sites
- Gypidula52 sites
- Rugosa51 sites
- Crinoidea50 sites
- Resserella50 sites
- Nucleospira48 sites
- Skenidioides48 sites
- Eospirifer42 sites
- Gastropoda41 sites
- Favosites40 sites
- Meristina38 sites
- Trilobita37 sites
- Strophonella36 sites
- Cyrtia34 sites
- Delthyris34 sites
- Sphaerirhynchia34 sites
- Bivalvia32 sites
- Craniops31 sites
- Dicoelosia29 sites
The Paleobiology Database records 501 sites for Isorthis, 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
143 references- Caradocian-Gedinnian echinoderm associations of Central and Eastern North America24
- Silurian brachiopods Dictyonellida, Strophomenida, Productida, Orthotetida, Protorthida and Orthida from Estonia18
- Brachiopods of the Henryhouse Formation (Silurian) of Oklahoma18
- Brachiopod communities of the Lithuanian Silurian17
- Wenlockian (Silurian) brachiopods of the Cape Phillips Formation, Baillie Hamilton Island, Arctic Canada: part I15
- Correlation of the Silurian rocks of China15
- Brachiopod biostratigraphy of the Llandoverian rocks of the Gaspé Peninsula12
- European province Late Silurian brachiopods from the Ciudad Victoria area, Tamaulipas, northeastern Mexico11
- Benthic community organization in the Ludlow Series of the Welsh Borderland10
- Some Wenlockian-Geddinian, chiefly brachiopod dominated communities of North America9
- Animal and plant communities of Podolia9
- Brachiopod assemblages from the Much Wenlock Limestone Formation of England and Wales9
Each of the 533 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. 131 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 Isorthis
- Source
- iDigBio
- Credit
- via iDigBio
- Licence
- CC0
- Commercial use
- the licence allows it
No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itIsorthinae through timeFormations of the SilurianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Kozlowski 1929