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Sphenophalos nevadanus
Taxonomy
Sphenophalos nevadanus was named by Merriam (1909) [genotype]. Its type specimen is UCMP 11887, a partial skull (the basal portion of the left horn witiY a portion of the frontal extending forward over the orbit, and backward to form a small portion of the brain case), and it is a 3D body fossil. Its type locality is Thousand Creek Formation, which is in a Hemphillian terrestrial horizon in the Thousand Creek Formation of Nevada. It is the type species of Sphenophalos.
Synonymy list
| Year | Name and author |
|---|---|
| 1909 | Sphenophalos nevadanus Merriam p. 325 fig. 7 |
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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.
†Sphenophalos nevadanus Merriam 1909
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. C. Merriam 1909 | Frontals not cavernom< at the base of the horns. Horns situated o.n the upper posterior region of the orbits, sloping back- ward, slightly outward, and tilted upward at an angle between twenty-five and thirty degrees from the plane of the frontals above the orbits. Horn cores flattened in a plane extending backward and inward from the orbits. A short distance above the base the horn cores flare or widen slightly in the direction of greatest diameter in cross-section. Outer anterior edge of the horn core arising over the upper posterior region of the orbit, and swinging backward with a suggestion of a twist. Surface of the horn core comparatively smooth, with a few pits or irregu- larities. Texture of the outer portion of the born core solid. Supraorbital foramina present in front of the middle of the antero-medial side of the base of the horn cores. |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009, Lillegraven 1979, Nowak 1999, Nowak 1991 | |||||
Age range: Hemphillian or 10.30000 to 4.90000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hemphillian | USA (Nevada) | Sphenophalos nevadanus (type locality: 19095) | |
| Late/Upper Hemphillian | USA (Arizona) | Sphenophalos nevadanus (19612) |