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Mediochoerus
Taxonomy
Mediochoerus was named by Schultz and Falkenbach (1941). Its type is Mediochoerus blicki.
It was assigned to Ticholeptinae by Schultz and Falkenbach (1941); to Merycoidodontidae by Lander (1998); and to Ustatochoerinae by Stevens and Stevens (2007) and Stevens et al. (2023).
It was assigned to Ticholeptinae by Schultz and Falkenbach (1941); to Merycoidodontidae by Lander (1998); and to Ustatochoerinae by Stevens and Stevens (2007) and Stevens et al. (2023).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1941 | Mediochoerus Schultz and Falkenbach p. 92 |
| 1998 | Mediochoerus Lander |
| 2007 | Mediochoerus Stevens and Stevens p. 164 |
| 2023 | Mediochoerus Stevens et al. p. 132 |
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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.
G. †Mediochoerus Schultz and Falkenbach 1941
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†Mediochoerus blicki Schultz and Falkenbach 1941
†Mediochoerus johnsoni Schultz and Falkenbach 1941
†Mediochoerus mohavensis Schultz and Falkenbach 1941
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. B. Schultz and C. H. Falkenbach 1941 | SKULL.-Medium size, ranging in length from approximately 220 mm. to 240 mm.; brachycephalic; occipital region fan-shaped (similar to Brachycrus, Ustatochoerus, and Ticholeptus); brain case inflated; zygomatic arch similar to Ticholeptus; prelacrimal pit shallow; nasals similar to those of Merycochoerus, shorter and more retracted than in Ticholeptus, but not as retracted as those in Brachycrus; anterior tip of nasals retracted to region above M1; infraorbital foramina above region of M 1 ; postglenoid process moderately robust, com- pressed anteroposteriorly; posterior portion of palate greatly extended toward pterygoid region (somewhat the same as in Ustatochoerus and Ticholeptus).
MANDIBLE.-Unknown. DENTITION.-Moderately hypsodont (much more hypsodont than Ticho- leptus, similar to Ustatochoerus); heavier than examples of Ticholeptus; C large; small cusps on the interior-posterior of P2 and P 3 but not pronounced as in Ustatochoerus; inferior series unknown. LIMBs.-Unknown. | |
| M. S. Stevens et al. 2023 | Medium-sized oreodonts with hypsodont upper and lower molars, with small cusps on P2 and P3; fan shaped occipital region; nasals retracted to area above M1; infraorbital foramina above M1, posterior palate extended toward pterygoids. Differs from Brachycrus in the degree of nasal retraction and the absence of a deep facial fossa. Differs from Ustatochoerus in the degree of nasal retraction, and the short upward inflected nasals not found in Ustatochoerus, the greater development of cusps on P2 and P3 in Ustatochoerus, as well as the greater hypsodonty of the latter genus. Differs from Ticholeptus in its much greater hypsodonty and greater degree of nasal retraction. |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1999, Carroll 1988, Hendy et al. 2009, Lander 1998, Lillegraven 1979 | |||||
Age range: base of the Barstovian to the top of the Early/Lower Hemingfordian or 16.30000 to 15.97000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Hemingfordian | USA (Nebraska) | M. johnsoni (17946) | |
| Barstovian | USA (California) | Ustatochoerus medius (19364) | |
| Early/Lower Barstovian | USA (Nebraska) | M. blicki (17972) |