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Amphicyon riggsi
Taxonomy
Amphicyon riggsi was named by McGrew (1939) [species not mentioned by Hunt 1998b]. Its type specimen is FMNH P12029, a partial skeleton (Anterior portion of skull with complete dentition (except for M3), jaw, proximal portion of ulna, and axis. C1 and m3 not fully erupted.), and it is a 3D body fossil. Its type locality is Rabbitt Creek, which is in a Miocene terrestrial horizon in the Deep River Formation of Montana.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1939 | Amphicyon riggsi McGrew p. 341 figs. 95 - 99 |
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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.
†Amphicyon riggsi McGrew 1939
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. O. McGrew 1939 | Small (see Measurements, p. 346); premolars unreduced; upper premolars not widely spaced (relatively); lower premolars closely spaced; protocone of P± prominent, situated internal to and but little anterior to the paracone, directed lingually and but slightly anteriorly; P4 with small posterior accessory cusp. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, subp = subphylum, p = phylum | |||||
| References: Hunt 1998, Carroll 1988, Ji et al. 2002, Lillegraven 1979, Kiessling 2004 | |||||