Ischyromyidae

Ischyromyidae is an extinct family of rodents from the late Paleocene to mid-Oligocene of North America, Asia, Europe, and possibly Africa. Ischyromyids include some of the oldest rodents in the fossil record, and they may be ancestral to one or more modern rodent families. They were diverse and widespread, occupying many terrestrial niches held today by rodents such as mice, rats, and ground squirrels. The earliest ischyromyids are from the Clarkforkian NALMA and the last are from the Whitneyan. Some ischyromyid subfamilies, such as Paramyinae and Reithroparamyinae, are sometimes raised to the level of their own families.

Ischyromyidae

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
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 24 million years on record.

The record covers at least 56 Mya to 31.8 Mya. No occurrence read is dated outside 59.24 Mya to 27.3 Mya.

Paleocene — about 20 of 1014 occurrencesPaleoceneEocene — about 924 of 1014 occurrencesEoceneOligocene — about 70 of 1014 occurrencesOligocene60–59 Mya — about 0.2 occurrences59–58 Mya — about 0.4 occurrences58–57 Mya — about 12 occurrences57–55 Mya — about 52 occurrences55–54 Mya — about 91 occurrences54–53 Mya — about 91 occurrences53–52 Mya — about 91 occurrences52–51 Mya — about 88 occurrences51–50 Mya — about 44 occurrences50–49 Mya — about 44 occurrences49–48 Mya — about 42 occurrences48–47 Mya — about 38 occurrences47–45 Mya — about 36 occurrences45–44 Mya — about 35 occurrences44–43 Mya — about 35 occurrences43–42 Mya — about 35 occurrences42–41 Mya — about 35 occurrences41–40 Mya — about 38 occurrences40–39 Mya — about 26 occurrences39–38 Mya — about 22 occurrences38–37 Mya — about 21 occurrences37–36 Mya — about 28 occurrences36–34 Mya — about 28 occurrences34–33 Mya — about 31 occurrences33–32 Mya — about 34 occurrences32–31 Mya — about 14 occurrences31–30 Mya — about 3 occurrences30–29 Mya — about 1 occurrence29–28 Mya — about 0.1 occurrences28–27 Mya — about 0.0 occurrences56 Mya31.8 Mya59.9 Mya26.7 Mya

1,014 occurrences of Ischyromyidae 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

1,014 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

84 formations

Willwood — 44.00°N, 108.00°WWillwood — 44.50°N, 108.00°WWillwood — 44.63°N, 108.50°WWillwood — 44.30°N, 109.00°WWillwood — 44.77°N, 109.08°WWillwood — 43.95°N, 107.57°WWillwood — 44.65°N, 109.93°WWillwood — 44.59°N, 108.86°WWillwood — 44.50°N, 108.67°WWillwood — 44.56°N, 108.70°WWillwood — 44.59°N, 108.62°WWillwood — 44.42°N, 108.69°WWillwood — 44.53°N, 108.43°WWillwood — 44.53°N, 108.79°WWillwood — 44.59°N, 108.41°WWillwood — 44.66°N, 108.53°WWillwood — 44.65°N, 108.72°WWillwood — 44.52°N, 108.57°WWillwood — 44.65°N, 108.90°WWillwood — 44.65°N, 108.83°WWillwood — 44.41°N, 108.79°WWillwood — 44.60°N, 108.78°WWillwood — 44.76°N, 108.88°WWillwood — 44.16°N, 107.87°WWillwood — 44.15°N, 107.86°WBridger — 42.70°N, 110.10°WBridger — 41.70°N, 109.00°WBridger — 41.20°N, 110.50°WBridger — 42.42°N, 109.35°WBridger — 41.80°N, 110.70°WBridger — 41.77°N, 110.33°WBridger — 41.13°N, 110.13°WBrule — 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°WWasatch — 41.27°N, 110.33°WWasatch — 40.60°N, 108.10°WWasatch — 41.70°N, 109.00°WWasatch — 42.70°N, 110.10°WWasatch — 41.80°N, 107.00°WWasatch — 41.20°N, 110.50°WWasatch — 41.80°N, 110.70°WWasatch — 41.75°N, 108.00°WWasatch — 42.37°N, 108.91°WWasatch — 41.83°N, 110.75°WWasatch — 41.86°N, 110.75°WWind River — 44.00°N, 106.60°WWind River — 43.20°N, 107.10°WWind River — 43.20°N, 108.20°WWind River — 43.20°N, 107.33°WDeBeque — 40.00°N, 107.90°WDeBeque — 39.70°N, 107.60°WDeBeque — 39.20°N, 108.20°WFriars — 32.90°N, 117.10°WFriars — 32.78°N, 117.07°WSespe — 34.30°N, 119.00°WSespe — 33.83°N, 117.71°WUinta — 40.07°N, 109.28°WUinta — 40.17°N, 109.93°WUinta — 40.07°N, 109.70°WUinta — 40.20°N, 109.30°WWagon Bed ("Tepee Trail") — 43.20°N, 107.10°WSantiago — 33.40°N, 117.51°WSantiago — 32.90°N, 117.10°WSantiago — 33.19°N, 117.32°WSantiago — 33.13°N, 117.31°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°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°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°WSan Jose — 35.70°N, 107.00°WSan Jose — 36.50°N, 107.00°WDevil's Graveyard — 29.20°N, 103.20°WDevil's Graveyard — 29.90°N, 104.20°WRenova — 45.00°N, 112.80°WRenova — 46.00°N, 112.00°WRenova — 45.90°N, 112.25°WAycross — 43.70°N, 108.70°WAycross — 43.90°N, 110.80°WAycross — 44.30°N, 109.00°WHuerfano — 37.80°N, 105.10°WMission Valley — 32.90°N, 117.10°WWashakie — 40.60°N, 108.10°WWashakie — 41.70°N, 109.00°WChambers Tuff — 29.90°N, 104.20°WCreechbarrow Limestone — 50.65°N, 2.12°WTienen — 50.33°N, 4.28°ETienen — 50.82°N, 5.10°E

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The named rock units Ischyromyidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 60 further formations hold fewer occurrences each and are not listed. 92 occurrences have no formation on record, which is common for older literature.

Ischyromyidae and its relatives

Eocene

Where Ischyromyidae and its relatives were recorded in the Eocene.

Found in the same rock

991 taxa

The Paleobiology Database records 654 sites for Ischyromyidae, 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

204 references

Each of the 1,014 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. 192 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 Ischyromyidae

Credit
nobody named on the record
Licence
CC0
Commercial use
the licence allows it

No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.

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. Alston 1876