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Alphagaulus pristinus
Taxonomy
Mylagaulus pristinus was named by Douglass (1903) [type locality is CM locality 1111, Lower Madison Valley Formation, Montana]. Its type specimen is CM 742, a mandible (single left dentary with newly erupted p4, m2–3), and it is a 3D body fossil.
It was recombined as Mesogaulus pristinus by Cook and Gregory (1941); it was recombined as Alphagaulus pristinus by Korth (2000), Tabrum and Nichols (2001), Calede and Hopkins (2012).
It was recombined as Mesogaulus pristinus by Cook and Gregory (1941); it was recombined as Alphagaulus pristinus by Korth (2000), Tabrum and Nichols (2001), Calede and Hopkins (2012).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1903 | Mylagaulus pristinus Douglass |
| 1903 | Mylagaulus proximus Douglass |
| 1903 | Mylagaulus pristinus Douglass p. 187 fig. 26 |
| 1941 | Mesogaulus pristinus Cook and Gregory |
| 1941 | Mesogaulus proximus Cook and Gregory |
| 2000 | Alphagaulus pristinus Korth |
| 2001 | Alphagaulus pristinus Tabrum and Nichols |
| 2012 | Alphagaulus pristinus Calede and Hopkins p. 152 figs. 2-9 |
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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.
†Alphagaulus pristinus Douglass 1903
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Invalid names: Mylagaulus proximus Douglass 1903 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. J. M. Calede and S. S. B. Hopkins 2012 | Smallest member of the genus Alphagaulus; adult postorbital index (0.40) larger than in A. tedfordi (0.25), similar to A. vetus (0.36); dentary with posterodorsally to anteroventrally wide and strong angular process; dentition most similar to that of A. vetus; no more than six fossettes on both P4 and p4 unlike any other species of the genus Alphagaulus; fewer fossetids on aver- age on p4 than in any other species of the genus; only two lakes in the posterior lobe of the P4 in early stage of wear; parafossette occupies complete anterior lobe of P4, overlaps both lobes; in late stage of wear, only parafossette occupies anterior lobe; all other fossettes in larger posterior lobe of P4 are on either side of parafossette except for metafossette, which is roughly aligned with posterior branch of parafossette; pattern of fossettids unlike that of A. tedfordi in orientation, and distribution: five main fossettids aligned anteroposteriorly, three on lingual side with, from anterior to posterior, parafossettid, mesofossetid, and metafossetid, and two on buccal side with, from anterior to posterior, protofossetid and hypofossetid; occlusal outline of mid-wear P4 does not retain outline of mesostyle; metafossette simple at every wear stage; postcranial skeleton relatively gracile unlike A. tedfordi. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Ji et al. 2002, Lillegraven 1979, Hendy et al. 2009, Nowak 1999, Carroll 1988 | |||||
Age range: Barstovian or 16.30000 to 12.50000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Miocene | USA (Idaho) | Mesogaulus pristinus (18980) | |
| Hemingfordian - Barstovian | USA (Montana) | Alphagaulus pristinus (19084) | |
| Barstovian | USA (Montana) | Mesogaulus paniensis (18894) | |
| Barstovian | USA (Nevada) | Mylagaulus pristinus (19103) | |
| Early/Lower Barstovian | USA (Montana) | Mylagaulus vetus (18803) |