Apatemyidae
Apatemyidae is an extinct family of placental mammals that took part in the first placental evolutionary radiation together with other early mammals, such as the leptictids. Their relationships to other mammal groups are controversial; a 2010 study found them to be basal members of Euarchontoglires.

Chris Woodrich · CC BY-SA 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
- ApatotheriaPBDB
- Diet
- herbivorePBDB
- Life habit
- arborealPBDB
- Motility
- actively mobilePBDB, for Osteichthyes
- Environment
- terrestrialPBDB
Time the record covers
At least 34 million years on record.
The record covers at least 61.66 Mya to 27.3 Mya. No occurrence read is dated outside 66 Mya to 18.5 Mya.
246 occurrences of Apatemyidae 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
246 occurrencesThese 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
50 formations
- Willwood Formation38
- Bridger Formation28
- Wasatch Formation21
- Fort Union Formation18
- Chadron Formation11
- Lignites de Soissonais Formation11
Loading coastlines…
The named rock units Apatemyidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 26 further formations hold fewer occurrences each and are not listed. 27 occurrences have no formation on record, which is common for older literature.
Apatemyidae and its relatives
EoceneWhere Apatemyidae and its relatives were recorded in the Eocene.
Found in the same rock
2,479 taxa- Apatemys39 sites
- Coryphodon35 sites
- Haplomylus speirianus29 sites
- Labidolemur kayi28 sites
- Ectocion osbornianus27 sites
- Hyopsodus27 sites
- Apatemys bellulus25 sites
- Phenacodus24 sites
- Thryptacodon antiquus24 sites
- Paramys copei23 sites
- Phenacodus vortmani23 sites
- Viverravus acutus23 sites
- Phenacolemurinae22 sites
- Herpetotherium knighti21 sites
- Herpetotherium innominatum20 sites
- Miacidae20 sites
- Peradectes20 sites
- Prodiacodon tauricinerei20 sites
- Cantius mckennai19 sites
- Nyctitherium19 sites
- Omomys carteri19 sites
- Diacodexis18 sites
- Diacodexis metsiacus18 sites
- Hyopsodus paulus18 sites
The Paleobiology Database records 204 sites for Apatemyidae, 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
103 references- Synonymies and reidentifications of North American fossil mammals24
- Apatotheria (Mammalia) de l'Eocène inférieur de France et de Belgique15
- Stratigraphy and mammalian paleontology of the McCullough Peaks, northern Bighorn Basin, Wyoming: Implications for biochronology, basin development, and community reorganization across the Paleocene-Eocene boundary13
- Mammalian Fauna From the Lower Bridger Formation (Bridger A, Early Middle Eocene) of the Southern Green River Basin, Wyoming8
- Time resolution in mammalian evolution: sampling, lineages and faunal turnover8
- Distribution and stratigraphic correlation of upper Paleocene and lower Eocene fossil mammal and plant localities of the Fort Union, Willwood, and Tatman formations, southern Bighorn Basin, Wyoming7
- Evolutionary History of Microsyopoidea (Mammalia, ?Primates) and the Relationship Between Plesiadapiformes and Primates7
- Les mammiferes d'Egerkingen et l'histoire des faunes de l'Eocene d'Europe7
- The Tiffanian Land-Mammal Age (middle and late Paleocene) in the northern Bighorn Basin, Wyoming6
- Eocene mammal faunas of San Diego County6
- Apatemyids (Mammalia, Apatotheria) from the middle Chadronian (late Eocene) of Sioux County, Nebraska, USA5
- Revision of the Wind River faunas, early Eocene of central Wyoming. Part 5. Geology and biostratigraphy of the upper part of the Wind River Formation, northeastern Wind River Basin5
Each of the 246 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. 91 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 Apatemyidae
- Source
- Wikipedia/Commons
- Credit
- Chris Woodrich
- Licence
- CC BY-SA 4.0
- Commercial use
- the licence allows it
No 3D scan of Apatemyidae 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, “Apatemyidae”
- 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 itApatotheria through timeFormations of the EoceneThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Matthew 1909