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Arenahippus aemulor
Taxonomy
Hyracotherium aemulor was named by Gingerich (1991). Its type specimen is UMMP 71523, a mandible (left and right mandibles with rightI1toM3andleftI2toM3), and it is a 3D body fossil. Its type locality is SC-34, which is in a Wasatchian terrestrial horizon in the Willwood Formation of Wyoming.
It was recombined as Arenahippus aemulor by Froehlich (2002).
It was recombined as Arenahippus aemulor by Froehlich (2002).
Synonymy list
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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 aemulor Gingerich 1991
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. J. Froehlich 2002 | This taxon lacks any unambiguous autapo- morphies but the clade composed of Arenahippus aemulor and all more-derived equids is uniquely diagnosed by the presence of a single medial cusp on the P2 (Character 21, 0 to 1), and a moderate M3 hypolophid (Character 104, 0 to 1) but lacks a some- what anterior P3 paraconule (Character 24, 0 to 1), molar metaconid twinned and equal in size (Character 83, 1 to 2), and lower molar metaconid separation large (Character 84, 0 to 1), the synapomorphies of the next more-derived equid clade. This diagnosis differs markedly from that of Gingerich (1991) which distinguished the taxon based largely on size. Gingerich suggested that the postcanine diastema may be longer than that of other Wasatchian equids. Independent observations largely confirm this, although there is considerable variation. If this is true, then a longer postcanine diastema would constitute a single autapomorphy for the taxon |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Nowak 1991, Hendy et al. 2009, Carroll 1988, Ji et al. 2002 | |||||
Age range: Wasatchian or 55.80000 to 50.30000 Ma
Collections (116 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Wasatchian | USA (Wyoming) | Arenahippus aemulor (15790 15826 15835) Hyracotherium aemulor (15510 15511 15512 15513 15516 15517 15518 15520 15522 15523 15524 15531 15532 15536 15538 15541 15542 15544 15545 15546 15548 15549 15551 15553 15554 15592 15683 15699 15728 15741 15742 type locality: 15743 15744 15745 15757 15758 15767 15770 15798 15799 15800 15801 15802 15804 15810 15827 15828 15829 46641 46656 46666 46667 46672 46673 46674 46675 46686 46687 46688 46689 46693 46694 46697 46698 46721 46724 46769 46770 46771 46772 46773 46775 46776 46777 46778 46779 46782 46784 46789 46791 46792 46794 46795 46797 46798 46799 46800 46801 46805 46807 46809 46814 46815 46816 46817 46818 46819 46828 46830 46831 46832 46833 46834 46835 46836 46837 46838 46839 46840 46841 46844 46852) | |
| Early/Lower Eocene | USA (Wyoming) | Hyracotherium aemulor (15709) |