Equoidea
Equoidea is a superfamily of hippomorph perissodactyls containing the Equidae, Palaeotheriidae, and other basal equoids of unclear affinities, of which members of the genus Equus are the only extant species. The earliest fossil record of the Equoidea proves unclear, but they possibly could have originated during the late Paleocene in Europe or Asia. Definite fossil records of equoids are recorded by the earliest Eocene, in which the earliest equids in North America and basal equoids of unclear affinities in Europe both appeared. Palaeotheres are thought to have originated later in the early Eocene of Europe, although some researchers disagree on whether the subfamily Pachynolophinae belongs to the Palaeotheriidae.

ДиБгд · 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
- PerissodactylaPBDB
- Diet
- browser, grazerPBDB, for Perissodactyla
- Life habit
- ground dwellingPBDB, for Perissodactyla
- Motility
- actively mobilePBDB, for Osteichthyes
- Environment
- terrestrialPBDB, for Eutheria
Time the record covers
At least 51 million years on record.
The record covers at least 51.1 Mya to 11.7 ka. No occurrence read is dated outside 56 Mya to 0 Mya.
7,193 occurrences of Equoidea on record, most of them in the Miocene. The Paleobiology Database records this as a living group. 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
7,193 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
540 formations
- Willwood Formation453
- Ash Hollow Formation · Ogallala Group210
- Valentine Formation · Ogallala Group186
- Shungura Formation · Omo Group153
- Koobi Fora Formation · Omo Group143
- DeBeque Formation115
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The named rock units Equoidea has been recovered from, largest first. Drawn where the rock is now, not where it formed. 516 further formations hold fewer occurrences each and are not listed. 2,783 occurrences have no formation on record, which is common for older literature.
Equoidea and its relatives
MioceneWhere Equoidea and its relatives were recorded in the Miocene.
Found in the same rock
636 taxa- Hyracotherium124 sites
- Coryphodon88 sites
- Hyopsodus86 sites
- Diacodexis55 sites
- Paramys excavatus52 sites
- Didymictis51 sites
- Esthonyx bisulcatus49 sites
- Paramys copei47 sites
- Phenacodus vortmani42 sites
- Phenacolemurinae41 sites
- Phenacodus40 sites
- Sifrhippus grangeri39 sites
- Cantius abditus38 sites
- Prototomus37 sites
- Haplomylus speirianus33 sites
- Cantius32 sites
- Hyopsodus powellianus30 sites
- Microsyopidae30 sites
- Vulpavus australis30 sites
- Viverravus29 sites
- Cantius frugivorus26 sites
- Copecion brachypternus26 sites
- Prodiacodon tauricinerei26 sites
- Arenahippus aemulor25 sites
The Paleobiology Database records at least 1,156 sites for Equoidea, 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
1,588 references- Synonymies and reidentifications of North American fossil mammals833
- Stratigraphy and mammalian paleontology of the McCullough Peaks, northern Bighorn Basin, Wyoming: Implications for biochronology, basin development, and community reorganization across the Paleocene-Eocene boundary235
- Family Equidae128
- Early Eocene Mammalian Fauna of the Piceance Creek Basin. Northwestern Colorado113
- Vertebrate biostratigraphy of the Ogallala Group in Nebraska103
- Phylogenetic Interrelationships and Evolution of North American Late Equidae103
- Cormohipparion and Hipparion (Mammalia, Perissodactyla, Equidae) from the Late Neogene of Florida98
- Systematics and Evolution of Early Eocene Perissodactyla (Mammalia) in the Clarks Fork Basin, Wyoming95
- Dietary Change and Evolution of Horses in North America84
- Les Périssodactyles (Mammalia) du gisement Bartonien supérieur de Robiac (Éocène moyen du Gard, Sud de la France)83
- Revision der Equoidea aus den eozänen Braunkohlen des Geiseltales bei Halle (DDR). (Revision of Equoidea from the Eocene lignite of the Geiseltal, Halle (DDR))73
- Biostratigraphy of Blancan and Irvingtonian mammals in the Fish Creek-Vallecito Creek section, southern California, and a review of the Blancan-Irvingtonian boundary72
Each of the 7,193 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. 1,576 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 Equoidea
- Source
- Wikipedia/Commons
- Credit
- ДиБгд
- Licence
- CC BY-SA 4.0
- Commercial use
- the licence allows it
No 3D scan of Equoidea 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, “Equoidea”
- 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 itPerissodactyla through timeFormations of the MioceneThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Hay 1902