Cylindrodontidae

Cylindrodontidae is a family of extinct rodents from the Eocene to Oligocene of North America and Asia. They were an early-diverging group of rodents with relatively short, broad skulls. As with other early rodents such as Ischyromyidae, the exact affinities of cylindrodontids are unclear. The oldest cylindrodontid (Tuscahomys) is from the Wasatchian NALMA, while the youngest members of the family are from the Whitneyan (mid-Oligocene).

Cylindrodon Douglass, 1901, a relative of Cylindrodontidae — not Cylindrodontidae itself

Not Cylindrodontidae. This is Cylindrodon Douglass, 1901, a relative — both are Cylindrodontidae.

via GBIF · 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
RodentiaPBDB
Diet
herbivorePBDB, for Rodentia
Life habit
ground dwellingPBDB, for Rodentia
Motility
actively mobilePBDB, for Osteichthyes
Environment
terrestrialPBDB, for Eutheria

Time the record covers

At least 23 million years on record.

The record covers at least 51.1 Mya to 27.3 Mya. No occurrence read is dated outside 56 Mya to 18.5 Mya.

Paleocene — about 0 of 219 occurrencesEocene — about 197 of 219 occurrencesEoceneOligocene — about 22 of 219 occurrencesOligoceneMiocene — about 0 of 219 occurrencesMiocene57–55 Mya — about 2 occurrences55–54 Mya — about 4 occurrences54–53 Mya — about 4 occurrences53–52 Mya — about 4 occurrences52–50 Mya — about 3 occurrences50–49 Mya — about 3 occurrences49–48 Mya — about 2 occurrences48–46 Mya — about 0.5 occurrences46–45 Mya — about 10 occurrences45–44 Mya — about 15 occurrences44–42 Mya — about 15 occurrences42–41 Mya — about 15 occurrences41–40 Mya — about 15 occurrences40–39 Mya — about 10 occurrences39–37 Mya — about 11 occurrences37–36 Mya — about 30 occurrences36–35 Mya — about 34 occurrences35–33 Mya — about 22 occurrences33–32 Mya — about 5 occurrences32–31 Mya — about 4 occurrences31–29 Mya — about 3 occurrences29–28 Mya — about 3 occurrences28–27 Mya — about 2 occurrences27–26 Mya — about 0.7 occurrences26–24 Mya — about 0.7 occurrences24–23 Mya — about 0.7 occurrences23–22 Mya — about 0.1 occurrences22–20 Mya — about 0.1 occurrences20–19 Mya — about 0.1 occurrences19–18 Mya — about 0.0 occurrences51.1 Mya27.3 Mya56.8 Mya17.8 Mya

219 occurrences of Cylindrodontidae on record, most of them in the Eocene. 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

219 occurrences

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

37 formations

Friars — 32.90°N, 117.10°WFriars — 32.78°N, 117.07°WChadron — 42.40°N, 103.80°WChadron — 42.80°N, 103.40°WChadron — 45.47°N, 112.62°WChadron — 46.10°N, 103.30°WChadron — 42.75°N, 103.65°WWhite River — 43.20°N, 107.10°WWhite River — 43.20°N, 108.20°WWhite River — 40.80°N, 103.10°WWhite River — 40.97°N, 106.22°WWillwood — 43.95°N, 107.57°WWillwood — 44.76°N, 108.88°WWillwood — 44.16°N, 107.87°WWillwood — 44.15°N, 107.86°WWagon Bed ("Tepee Trail") — 43.20°N, 107.10°WUinta — 40.17°N, 109.93°WUinta — 40.07°N, 109.70°WUinta — 40.08°N, 109.27°WSespe — 34.30°N, 119.00°WSespe — 34.58°N, 119.26°WSespe — 33.83°N, 117.71°WSantiago — 33.40°N, 117.51°WSantiago — 33.13°N, 117.29°WSantiago — 33.19°N, 117.32°WSantiago — 32.90°N, 117.10°WCypress Hills — 50.20°N, 107.60°WCypress Hills — 50.00°N, 107.90°WCypress Hills — 49.57°N, 109.88°WCypress Hills — 49.80°N, 109.00°WCypress Hills — 49.70°N, 109.00°WHsanda Gol — 45.27°N, 101.77°EHsanda Gol — 45.46°N, 101.20°EHsanda Gol — 45.45°N, 101.27°EHsanda Gol — 45.45°N, 101.37°EHsanda Gol — 45.30°N, 101.62°EHsanda Gol — 45.26°N, 101.72°EHsanda Gol — 45.30°N, 102.08°ERenova — 45.00°N, 112.80°WRenova — 46.00°N, 112.00°WRenova — 45.90°N, 112.25°WWasatch — 42.70°N, 110.10°WWasatch — 42.37°N, 108.91°WWasatch — 41.35°N, 108.82°WWasatch — 41.74°N, 108.38°WWasatch — 41.70°N, 109.00°WDevil's Graveyard — 29.20°N, 103.20°WDevil's Graveyard — 29.90°N, 104.20°WMission Valley — 32.90°N, 117.10°WUlantatal — 39.20°N, 105.57°EClimbing Arrow — 46.00°N, 112.00°WClimbing Arrow — 45.93°N, 111.62°WTuscahoma — 32.36°N, 88.70°WSweetwater — 32.66°N, 117.03°WDell Beds — 45.00°N, 112.80°WCapote Mountain Tuff — 29.90°N, 104.20°WErgilin Dzo — 44.00°N, 111.00°EErgilin Dzo — 43.40°N, 109.10°EDuchesne River — 40.20°N, 109.90°WWashakie — 41.70°N, 109.00°WWashakie — 41.18°N, 108.40°WChambers Tuff — 29.90°N, 104.20°W

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The named rock units Cylindrodontidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 13 further formations hold fewer occurrences each and are not listed. 24 occurrences have no formation on record, which is common for older literature.

Cylindrodontidae and its relatives

Eocene

Where Cylindrodontidae and its relatives were recorded in the Eocene.

Found in the same rock

1,382 taxa

The Paleobiology Database records 171 sites for Cylindrodontidae, 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

81 references

Each of the 219 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. 69 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 Cylindrodon Douglass, 1901

Source
GBIF
Credit
via GBIF
Licence
CC0
Commercial use
the licence allows it

No 3D scan of Cylindrodontidae 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

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 itRodentia through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Miller and Gidley 1918)