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Antilocapra pacifica
Taxonomy
Antilocapra pacifica was named by Richards and McCrossin (1991). Its type specimen is UCMP 131828, a partial skull, and it is a 3D body fossil. Its type locality is Big Break (UCMP V-87047), which is in a Pleistocene/Holocene terrestrial sandstone/sandstone in the Piper Series Sands Formation of California.
Synonymy list
| Year | Name and author |
|---|---|
| 1991 | Antilocapra pacifica Richards and McCrossin p. 628 figs. Figs. 3 - 6 |
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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.
†Antilocapra pacifica Richards and McCrossin 1991
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. D. Richards and M. L. McCrossin 1991 | Species exhibits single, tall-based, mediolaterally compressed, but highly inflated horn cores. Cranial size falls in the median range for A. americana whereas horn-core dimensions are greater than the modern range (Table 2). The horns are supraorbital, but differ from those of A. americana by arising from the whole supraorbital margin. The anterior origin of the horn core is placed superior to the frontolacrimal suture with the anterior border rising anterosuperiorly from this point. The bony prominence located at the posterior origin of the horn core in A. americana is incorporated into the posterior border of A. pacifica nov. sp. The core cross-section is more inflated throughout than in A. americana (Fig. 5). Compared to modern pronghorns, the outer wall of the postorbital process is rotated inferiorly. The portion of the temporal fossa located between the inferior border of the postorbital processand a line throughthe infratemporal crest is reduced (Figs. 4A, 4B). The posteornual fossa is oriented more posteriorly relative to the condition in A. americana. |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Lillegraven 1979, Hendy et al. 2009, Nowak 1991, Nowak 1999 | |||||
Age range: base of the Late/Upper Pleistocene to the top of the Holocene or 0.12900 to 0.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Pleistocene - Holocene | USA (California) | Antilocapra pacifica (type locality: 209581) |