Cimolomys
Cimolomys is a mammal genus from the Upper Cretaceous of North America. It was a member of the extinct order Multituberculata within the suborder Cimolodonta and family Cimolomyidae.

Uncredited · CC0 · 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
- CimolomyidaePBDB
- Diet
- herbivorePBDB, for Multituberculata
- Life habit
- arborealPBDB, for Multituberculata
- Motility
- actively mobilePBDB, for Osteichthyes
- Environment
- terrestrialPBDB, for Mammalia
Time the record covers
At least 11 million years on record.
The record covers at least 83.6 Mya to 72.2 Mya. No occurrence read is dated outside 85.7 Mya to 66 Mya.
93 occurrences of Cimolomys on record, most of them in the Late Cretaceous. 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
93 occurrences- Late Cretaceous100%
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
21 formations
- Lance Formation28
- Hell Creek Formation · Montana Group9
- Mesaverde Formation8
- Judith River Formation · Montana Group7
- Wahweap Formation6
- Milk River Formation5
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The named rock units Cimolomys has been recovered from, largest first. Drawn where the rock is now, not where it formed. 2 occurrences have no formation on record, which is common for older literature.
Cimolomys and its relatives
Late CretaceousWhere Cimolomys and its relatives were recorded in the Late Cretaceous.
Found in the same rock
601 taxa- Cimolodon nitidus28 sites
- Meniscoessus robustus28 sites
- Mesodma25 sites
- Hadrosauridae24 sites
- Lepisosteus occidentalis23 sites
- Scapherpeton tectum21 sites
- Didelphodon vorax20 sites
- Paronychodon20 sites
- Tyrannosauridae20 sites
- Anura19 sites
- Myledaphus bipartitus19 sites
- Theropoda19 sites
- Trionychidae18 sites
- Albanerpetontidae17 sites
- Champsosaurus17 sites
- Chelydridae17 sites
- Gypsonictops hypoconus17 sites
- Ceratopsidae16 sites
- Dromaeosauridae16 sites
- Opisthotriton kayi16 sites
- Crocodylia15 sites
- Lonchidion selachos15 sites
- Mesodma thompsoni15 sites
- Pediomys elegans15 sites
The Paleobiology Database records 78 sites for Cimolomys, 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
40 references- The mammals and horned dinosaurs of the Lance Formation of Niobrara County, Wyoming15
- Fossil mammals from the "Mesaverde" Formation (Late Cretaceous, Judithian) of the Bighorn and Wind River basins, Wyoming, with definitions of Late Cretaceous North American Land-Mammal "Ages"9
- Fossil mammals of the type Lance Formation, Wyoming. Part I. Introduction and Marsupialia8
- Vertebrate palaeocommunities of the lower Judith River Group (Campanian) of southeastern Alberta, Canada, as interpreted from vertebrate microfossil assemblages5
- Early Campanian multituberculates (Mammalia: Allotheria) from the upper Milk River Formation, Alberta5
- Preliminary report on Late Cretaceous mammals of the Kaiparowits Plateau, southern Utah4
- A study of Mammalia and geology across the Cretaceous-Tertiary boundary in Garfield County, Montana4
- Latest Cretaceous multituberculates of the Black Butte Station local fauna (Lance Formation, southwestern Wyoming), with implications for compositional differences among mammalian local faunas of the Western Interior3
- Late Cretaceous mammals from Cedar Canyon, southwestern Utah3
- Mammalian fauna of the Judith River Formation (Late Cretaceous, Judithian), northcentral Montana3
- Latest Cretaceous mammals of upper part of Edmonton Formation of Alberta, Canada, and review of marsupial-placental dichotomy in mammalian evolution3
- Vertebrates of the Iron Springs Formation, Upper Cretaceous, southwestern Utah2
Each of the 93 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. 28 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 Cimolomys
- Source
- Wikipedia/Commons
- Credit
- nobody named on the record
- Licence
- CC0
- Commercial use
- the licence allows it
No 3D scan of Cimolomys 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
- Source
- Wikipedia, “Cimolomys”
- 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 itCimolomyidae through timeFormations of the Late CretaceousThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Marsh 1889