Ischyromys

Ischyromys is an extinct genus of rodent from North America.

Ischyromys

Jonathan Chen · CC BY 4.0 · 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
IschyromyidaePBDB
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 7.9 million years on record.

The record covers at least 39.7 Mya to 31.8 Mya. No occurrence read is dated outside 45.9 Mya to 29.5 Mya.

Eocene — about 70 of 138 occurrencesEoceneOligocene — about 68 of 138 occurrencesOligocene46–46 Mya — about 0.0 occurrences46–45 Mya — about 0.1 occurrences45–45 Mya — about 0.1 occurrences45–44 Mya — about 0.1 occurrences44–44 Mya — about 0.1 occurrences44–43 Mya — about 0.1 occurrences43–42 Mya — about 0.1 occurrences42–42 Mya — about 0.1 occurrences42–41 Mya — about 0.1 occurrences41–41 Mya — about 0.1 occurrences41–40 Mya — about 0.1 occurrences40–39 Mya — about 0.8 occurrences39–39 Mya — about 2 occurrences39–38 Mya — about 2 occurrences38–38 Mya — about 2 occurrences38–37 Mya — about 2 occurrences37–37 Mya — about 9 occurrences37–36 Mya — about 11 occurrences36–35 Mya — about 11 occurrences35–35 Mya — about 11 occurrences35–34 Mya — about 11 occurrences34–34 Mya — about 14 occurrences34–33 Mya — about 18 occurrences33–32 Mya — about 18 occurrences32–32 Mya — about 18 occurrences32–31 Mya — about 4 occurrences31–31 Mya — about 1 occurrence31–30 Mya — about 1 occurrence30–30 Mya — about 1 occurrence30–29 Mya — about 0.2 occurrences39.7 Mya31.8 Mya46.4 Mya29 Mya

138 occurrences of Ischyromys 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

138 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

13 formations

Brule — 42.90°N, 105.20°WBrule — 42.80°N, 103.10°WBrule — 40.80°N, 103.10°WBrule — 43.90°N, 102.40°WBrule — 43.30°N, 102.50°WBrule — 46.90°N, 102.80°WBrule — 42.40°N, 103.80°WBrule — 43.20°N, 103.20°WBrule — 43.85°N, 102.50°WBrule — 43.71°N, 102.58°WBrule — 46.40°N, 103.30°WBrule — 43.76°N, 101.93°WWhite River — 43.20°N, 108.20°WWhite River — 43.20°N, 107.10°WWhite River — 40.80°N, 103.10°WWhite River — 40.97°N, 106.22°WChadron — 43.60°N, 102.45°WChadron — 42.40°N, 103.80°WChadron — 42.80°N, 103.40°WChadron — 42.90°N, 105.20°WChadron — 45.47°N, 112.62°WChadron — 46.10°N, 103.30°WChadron — 42.75°N, 103.65°WRenova — 45.00°N, 112.80°WRenova — 46.00°N, 112.00°WRenova — 45.90°N, 112.25°WCypress Hills — 50.00°N, 107.90°WCypress Hills — 49.57°N, 109.88°WCypress Hills — 49.80°N, 109.00°WFlorissant — 38.93°N, 105.28°WWagon Bed ("Tepee Trail") — 43.20°N, 107.10°WDell Beds — 45.00°N, 112.80°WChambers Tuff — 29.90°N, 104.20°WCook Ranch — 45.00°N, 112.80°WPomerado — 32.85°N, 117.03°WSage Creek — 45.00°N, 112.80°WClimbing Arrow — 45.93°N, 111.62°W

Loading coastlines…

The named rock units Ischyromys has been recovered from, largest first. Drawn where the rock is now, not where it formed. 28 occurrences have no formation on record, which is common for older literature.

Ischyromys and its relatives

Eocene

Where Ischyromys and its relatives were recorded in the Eocene.

Found in the same rock

602 taxa

The Paleobiology Database records 123 sites for Ischyromys, 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

50 references

Each of the 138 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. 38 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 content2

Picture of Ischyromys

Credit
Jonathan Chen
Licence
CC BY 4.0
Commercial use
the licence allows it

3D model

Source
Sketchfab
Licence
CC Attribution-NonCommercial
Commercial use
the licence does not allow it

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 itIschyromyidae through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Leidy 1856