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Ustatochoerus leptoscelos
Taxonomy
Hypsiops leptoscelos was named by Stevens et al. (1969). Its type specimen is TMM 40635-8, a partial skeleton (associated skull, mandibles, left pes, left innominate bone, and greater part of left tibia), and it is a 3D body fossil. Its type locality is Castolon (TMM 40635), which is in a Harrisonian terrestrial horizon in the Delaho Formation of Texas.
It was recombined as Phenacocoelus leptoscelos by Woodburne et al. (1974), Stevens (1977) and MacFadden (1980); it was recombined as Merychyus leptoscelos by Kelly and Lander (1988); it was synonymized subjectively with Merycoides harrisonensis by Lander (1998); it was recombined as Ustatochoerus leptoscelos by Stevens and Stevens (1989), Woodburne (1998), Stevens and Stevens (2007) and Stevens et al. (2023).
It was recombined as Phenacocoelus leptoscelos by Woodburne et al. (1974), Stevens (1977) and MacFadden (1980); it was recombined as Merychyus leptoscelos by Kelly and Lander (1988); it was synonymized subjectively with Merycoides harrisonensis by Lander (1998); it was recombined as Ustatochoerus leptoscelos by Stevens and Stevens (1989), Woodburne (1998), Stevens and Stevens (2007) and Stevens et al. (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1969 | Hypsiops leptoscelos Stevens et al. p. 26 figs. Fig. 9, A-C, F-I; Table 3 |
| 1974 | Phenacocoelus leptoscelos Woodburne et al. p. 19 figs. Text-fig. 6, A to D ; Table 2 |
| 1977 | Phenacocoelus leptoscelos Stevens |
| 1980 | Phenacocoelus leptoscelos MacFadden p. 96 |
| 1988 | Merychyus leptoscelos Kelly and Lander |
| 1989 | Ustatochoerus leptoscelos Stevens and Stevens |
| 1998 | Ustatochoerus leptoscelos Woodburne |
| 2007 | Ustatochoerus leptoscelos Stevens and Stevens p. 166 |
| 2023 | Ustatochoerus leptoscelos Stevens et al. p. 131 figs. Figure 107; Appendix 13B |
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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.
†Ustatochoerus leptoscelos Stevens et al. 1969
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. S. Stevens et al. 1969 | A small Hypsiops with higher crowned teeth and much more
slender limbs than H. luskensis. | |
| M. S. Stevens et al. 2023 | Smallest species of Ustatochoerus, with slightly elongate nasals, deeper narial notch, facial vacuity, premolars with prominent labial cingula, and relatively hypsodont molars. These features all distinguish this taxon from other Arikareean oreodonts and ally it with Ustatochoerus. |