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Taxonomy
Machairodus hesperus was named by Gazin (1933). Its type specimen is 12614, a mandible (partial left ramus), and it is a 3D body fossil.
It was recombined as Megantereon hesperus by Schultz and Martin (1970), Kurten and Anderson (1980), Berta and Galiano (1983) and Martin et al. (1988).
It was recombined as Megantereon hesperus by Schultz and Martin (1970), Kurten and Anderson (1980), Berta and Galiano (1983) and Martin et al. (1988).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1933 | Machairodus hesperus Gazin |
| 1970 | Megantereon hesperus Schultz and Martin |
| 1980 | Megantereon hesperus Kurten and Anderson p. 186 |
| 1983 | Megantereon hesperus Berta and Galiano p. 893 |
| 1988 | Megantereon hesperus Martin et al. |
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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.
†Megantereon hesperus Gazin 1933
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. L. Gazin 1933 | Size distinctly small. Lower carnassial slender and
tapering posteriorly. Protoconid shearing blade long. Angle between paraconid and protoconid shearing blades relatively acute. Very slight vestigial heel or metaconid present. Anterior portion of masseteric fossa extends forwardto point below notch of M1,and upwardnearly to tooth cingulum. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1991, Ji et al. 2002, Hendy et al. 2009, Lillegraven 1979, Carroll 1988 | |||||
Age range: base of the Hemphillian to the top of the Blancan or 10.30000 to 1.80000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hemphillian | USA (Florida) | Megantereon hesperus (18577) | |
| Late/Upper Hemphillian | USA (Florida) | Megantereon hesperus (18532 18573) | |
| Blancan | USA (Nebraska) | Megantereon hesperus (19955) | |
| Blancan | USA (Kansas) | Homotheriini indet. (19936) | |
| Blancan | USA (Idaho) | Machairodus hesperus (19819) |