Pseudotomus

Pseudotomus is an extinct genus of ischyromyid rodent from Eocene North America. Pseudotomus was a large early rodent with habits similar to ground squirrels. It belongs to the tribe Manitshini and the subfamily Paramyinae.

Pseudotomus

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
ManitshiniPBDB
Diet
herbivorePBDB, for Rodentia
Life habit
ground dwellingPBDB
Motility
actively mobilePBDB, for Osteichthyes
Environment
terrestrialPBDB, for Eutheria

Time the record covers

At least 8.9 million years on record.

The record covers at least 45.9 Mya to 37 Mya. No occurrence read is dated outside 51.1 Mya to 33.9 Mya.

Eocene — about 38 of 38 occurrencesEoceneOligocene — about 0 of 38 occurrences52–51 Mya — about 0.4 occurrences51–50 Mya — about 2 occurrences50–50 Mya — about 2 occurrences50–49 Mya — about 2 occurrences49–49 Mya — about 2 occurrences49–48 Mya — about 2 occurrences48–47 Mya — about 2 occurrences47–47 Mya — about 2 occurrences47–46 Mya — about 2 occurrences46–46 Mya — about 2 occurrences46–45 Mya — about 1 occurrence45–44 Mya — about 1 occurrence44–44 Mya — about 1 occurrence44–43 Mya — about 1 occurrence43–43 Mya — about 1 occurrence43–42 Mya — about 1 occurrence42–41 Mya — about 1 occurrence41–41 Mya — about 1 occurrence41–40 Mya — about 1 occurrence40–39 Mya — about 1 occurrence39–39 Mya — about 0.9 occurrences39–38 Mya — about 0.9 occurrences38–38 Mya — about 0.9 occurrences38–37 Mya — about 0.9 occurrences37–36 Mya — about 0.2 occurrences36–36 Mya — about 0.2 occurrences36–35 Mya — about 0.2 occurrences35–35 Mya — about 0.2 occurrences35–34 Mya — about 0.2 occurrences34–33 Mya — about 0.0 occurrences45.9 Mya37 Mya51.6 Mya33.4 Mya

38 occurrences of Pseudotomus 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

38 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

12 formations

Uinta — 40.07°N, 109.28°WUinta — 40.17°N, 109.93°WUinta — 40.20°N, 109.30°WAycross — 43.70°N, 108.70°WAycross — 44.30°N, 109.00°WBridger — 41.20°N, 110.50°WBridger — 41.70°N, 109.00°WWasatch — 42.70°N, 110.10°WFriars — 32.90°N, 117.10°WColmena Tuff — 29.90°N, 104.20°WCypress Hills — 50.20°N, 107.60°WCypress Hills — 50.00°N, 107.90°WChambers Tuff — 29.90°N, 104.20°WGreen River — 40.20°N, 109.90°WWapiti — 44.30°N, 109.00°WSantiago — 33.15°N, 117.31°WJohn Day — 44.92°N, 120.30°W

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The named rock units Pseudotomus has been recovered from, largest first. Drawn where the rock is now, not where it formed. 4 occurrences have no formation on record, which is common for older literature.

Pseudotomus and its relatives

Eocene

Where Pseudotomus and its relatives were recorded in the Eocene.

Found in the same rock

465 taxa

The Paleobiology Database records 35 sites for Pseudotomus, 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

22 references

Each of the 38 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. 10 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 Pseudotomus

Credit
nobody named on the record
Licence
CC0
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 itManitshini through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Cope 1872)