| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Arenahippus pernix
Taxonomy
Eohippus pernix was named by Marsh (1876). Its type specimen is YPM 11304 (lectotype), a set of limb elements (left astragalus and associated distal tibia), and it is a 3D body fossil. Its type locality is Bitter Creek, which is in a Wasatchian terrestrial horizon in the Wasatch Formation of Wyoming.
It was synonymized subjectively with Hyracotherium index by Wortman (1896), Trouessart (1898) and Matthew (1899); it was synonymized subjectively with Hyracotherium vasacciense by Kitts (1956); it was recombined as Hyracotherium pernix by Gingerich (1991) and MacFadden (1998); it was considered a nomen dubium by Granger (1908); it was recombined as Arenahippus pernix by Froehlich (2002).
It was synonymized subjectively with Hyracotherium index by Wortman (1896), Trouessart (1898) and Matthew (1899); it was synonymized subjectively with Hyracotherium vasacciense by Kitts (1956); it was recombined as Hyracotherium pernix by Gingerich (1991) and MacFadden (1998); it was considered a nomen dubium by Granger (1908); it was recombined as Arenahippus pernix by Froehlich (2002).
Synonymy list
Is something missing? Join the Paleobiology Database and enter the data
|
|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Arenahippus pernix Marsh 1876
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. J. Froehlich 2002 | This taxon lacks any unambiguous autapomorphies but the clade composed of Arenahippus pernix and all more-derived equids is uniquely diagnosed by the presence of P3 paraconule somewhat anterior (Character 24, 0 to 1), lower molar metaconid twinned and equal in size (Character 83, 1 to 2), and lower molar metaconid separation large (Character 84, 0 to 1) but lacks the crenulated M3 heel (Character 103, 0 to 1), the synapomorphy of the next more-derived equid clade. |
Measurements
No measurements are available
|
|
||||
|
|
||||
|
|
||||
|
|
||||
| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Lillegraven 1979, Carroll 1988, Ji et al. 2002, Nowak 1991 | |||||
Age range: base of the Graybullian to the top of the Wasatchian or 55.80000 to 50.30000 Ma
Collections (112 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Graybullian | USA (Wyoming) | Hyracotherium pernix (15701) | |
| Wasatchian | USA (Wyoming) | Arenahippus pernix (15673 118482) Hyracotherium pernix (type locality: 15455 15556 15557 15558 15564 15567 15687 15692 15694 15695 15696 15697 15698 15702 15703 15704 15705 15706 15707 15768 15769 15782 15785 15803 15805 15806 15807 15811 15812 15814 46682 46683 46692 46695 46696 46699 46700 46701 46702 46703 46704 46705 46706 46707 46709 46710 46711 46712 46713 46714 46715 46716 46717 46718 46719 46720 46728 46729 46730 46731 46732 46733 46734 46735 46736 46738 46739 46740 46741 46742 46743 46745 46746 46747 46748 46749 46753 46754 46755 46756 46757 46758 46759 46760 46761 46762 46763 46764 46765 46766 46767 46810 46811 46820 46825 46826 46827 46843 46845 46846 46847 46848 46849 46851) | |
| Early/Lower Eocene | USA (Wyoming) | Hyracotherium pernix (15680 15681 15684 15685 15700) |