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Granastrapotherium snorki
Taxonomy
Granastrapotherium snorki was named by Johnson and Madden (1997) [Holotype: UCMP 40358, a partial skull including the palate and basicranium preserving the complete upper dentition, including right and left canine, P4, and M1-3. Preserved also are the internal nares, inferior margin of the right orbit and an incomplete occipital condyle. The top of the face, neurocranium, and occipital region are missing]. Its type specimen is UCMP 40358, a partial skull (Partial skull including the palate and basicranium preserving the complete upper dentition), and it is a 3D body fossil. It is the type species of Granastrapotherium.
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Granastrapotherium snorki Johnson and Madden |
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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.
†Granastrapotherium snorki Johnson and Madden 1997
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. E. Johnson and R. H. Madden 1997 | As for type genus: Granastrapotherium may be distinguished from all other astrapotheres by lacking lower incisors, by possesing large, ever-growing, sexually dimorphic, horizontally implanted lower canine tusks that are round to oval in cross section; by having proportionally longer lower m2 and m3 crowns compared with m1; in lacking upper P3; and by having an upper P4 without parastyle. Granastrapotherium may be further distinguish from Uruguaytherium by possesing traces of the hypoflexid groove on the buccal aspect of the lower molars and by having a more distally oriented and bassally rounded lower molar metalophid. Granastraphotherium differs from Xenastrapotherium in having only very weakly developed upper molar lingual cingula and in lacking any connection between the protoloph and the ectoloph in the upper M3 |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| Humerus diameter | 2 | 144.7 | 135.0 | 155.0 | 145.0 | 14.1 | |
| Lower canine diameter | 4 | 35.8 | 26.5 | 46.5 | 37.5 | 10.7 | |
| Mandible height | 3 | 111.3 | 97.0 | 119.6 | 119.0 | 12.9 | |
| Upper canine diameter | 4 | 45.7 | 37.5 | 56.0 | 46.2 | 10.0 | |
| posterior part of the ectoloph of an M3 height | 1 | 73.0 | - | - | - | - |
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| Source: s = species, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Carroll 1988, Johnson and Madden 1997, Hendy et al. 2009 | |||||
Age range: base of the Laventan to the top of the Middle Miocene or 13.80000 to 11.60800 Ma
Collections (28 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Miocene | Peru | Granastrapotherium snorki (211380) | |
| Laventan | Colombia (Tolima) | Granastrapotherium snorki (143779 143781 143782 143783) | |
| Laventan | Peru (Ucayali) | Granastrapotherium snorki (144792 144793) | |
| Laventan | Colombia | Granastrapotherium snorki (13757) | |
| Laventan | Colombia (Huila) | Granastrapotherium snorki (133692 134806 135348 140051 143785 143795 145175 145617 185892 186607 187114 187115 187718 187719 187720 187721 187888 187970 188025 188028) |