Monotis

Momotarou2012 · CC BY-SA 3.0 · via Wikidata/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
- MonotidaePBDB
- Diet
- suspension feederPBDB, for Pectinida
- Life habit
- epifaunalPBDB, for Pectinida
- Motility
- stationaryPBDB, for Monotidae
- Vision
- blindPBDB, for Bivalvia
- Environment
- marinePBDB, for Pectinida
Time the record covers
At least 54 million years on record.
The record covers at least 259.857 Mya to 205.7 Mya. No occurrence read is dated outside 264.28 Mya to 201.4 Mya.
345 occurrences of Monotis on record, most of them in the Late 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
345 occurrences- Permianunder 1%
- Early Triassicunder 1%
- Middle Triassicunder 1%
- Late Triassic98%
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
36 formations
- Pardonet Formation · Schooler Creek Group51
- Otuk Formation12
- Umegatani Formation · Kochigatani Group10
- Halstatt Formation10
- Peschanka Formation9
- Nanshuangyashan Formation9
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The named rock units Monotis has been recovered from, largest first. Drawn where the rock is now, not where it formed. 12 further formations hold fewer occurrences each and are not listed. 170 occurrences have no formation on record, which is common for older literature.
Monotis and its relatives
Late TriassicWhere Monotis and its relatives were recorded in the Late Triassic.
Found in the same rock
985 taxa- Halobia14 sites
- Oxytoma mojsisovicsi14 sites
- Tosapecten subhiemalis14 sites
- Inoceramus ussuriensis12 sites
- Tosapecten10 sites
- Halobia fallax9 sites
- Chlamys mojsisovicsi8 sites
- Tosapecten suzukii8 sites
- Oxytoma7 sites
- Palaeopharus7 sites
- Entolioides6 sites
- Gryphaea keilhaui6 sites
- Oxytoma zitteli6 sites
- Pleuromya6 sites
- Schafhaeutlia6 sites
- Crinoidea5 sites
- Entolium kolymaense5 sites
- Epigondolella bidentata5 sites
- Heterastridium conglobatum5 sites
- Iranothalamia incrustans5 sites
- Oxytoma czekanowskii5 sites
- Rhacophyllites debilis5 sites
- Amblysiphonella4 sites
- Chlamys4 sites
The Paleobiology Database records 211 sites for Monotis, and this reads all 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
57 references- The Late Triassic bivalve Monotis in accreted terranes of Alaska40
- Markevich and Zakharov, 200433
- Late Triassic Bivalvia (Chiefly Halobiidae and Monotidae) from the Pardonet Formation, Williston Lake Area, Northeastern British Columbia, Canada26
- A systematic survey of the Mesozoic Bivalvia from Japan26
- Materialen zu einer Monographie der Halobiidae und Monotidae der Trias [Monograph on the Halobiidae and Monotidae of the Triassic]22
- New Data on the Upper Triassic Bivalve Monotis in North America, and the New Subgenus Pacimonotis14
- [Upper Triassic coastal deposits of Tugursky Bay (Western Priochothye)]14
- Triassic-Jurassic stratigraphy and Bivalvia of northern Priokhotye.14
- Fossil succession and sequence stratigraphy of the Upper Triassic of Black Bear Ridge, northeast British Columbia, a GSSP prospect for the Carnian-Norian boundary12
- Monotis fauna of China and its palaeobiogeographic significance11
- Systematics of New Zealand Monotis (Upper Triassic Bivalvia): subgenus Eomonotis9
- Succession and Variation of Monotis and the Associated Fauna in the Norian Pine River Bridge Section, British Columbia (Triassic, Pelecypoda)9
Each of the 345 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. 45 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 Monotis
- Source
- Wikidata/Commons
- Credit
- Momotarou2012
- Licence
- CC BY-SA 3.0
- 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 itMonotidae through timeFormations of the Late TriassicThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Bronn 1830