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Taxonomy
Osteoborus hilli was named by Johnston (1939). Its type specimen is Panhandle Plains Historical Museum No. 1558, a partial skull, and it is a 3D body fossil. Its type locality is Axtel, which is in a Hemphillian terrestrial horizon in Texas.
It was synonymized subjectively with Borophagus direptor by Kurten and Anderson (1980); it was recombined as Borophagus hilli by Wang et al. (1999), Wang et al. (2008), Tseng and Geisler (2016), Albright et al. (2019).
It was synonymized subjectively with Borophagus direptor by Kurten and Anderson (1980); it was recombined as Borophagus hilli by Wang et al. (1999), Wang et al. (2008), Tseng and Geisler (2016), Albright et al. (2019).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1939 | Osteoborus hilli Johnston p. 895 figs. 1 - 4 |
| 1944 | Osteoborus progressus Hibbard |
| 1956 | Osteoborus crassapineatus Olsen |
| 1979 | Borophagus crassapineatus Richey |
| 1999 | Borophagus hilli Wang et al. |
| 2008 | Borophagus hilli Wang et al. |
| 2016 | Borophagus hilli Tseng and Geisler p. 1 |
| 2019 | Borophagus hilli Albright et al. p. 172 |
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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.
†Borophagus hilli Johnston 1939
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Invalid names: Osteoborus crassapineatus Olsen 1956 [synonym], Osteoborus progressus Hibbard 1944 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. S. Johnston 1939 | Osteoborus hilli is considerably larger than the 0. cyonoides from the Middle Pliocene beds of Hemphill County, Texas. There is considerable variation within the latter spe- cies as shown in numerous upper and lower jaws in the collec- tions of the "\Vest Texas State College. In general massiveness the lower jaw of 0. hilli more closely approaches Borophagus diversidens, the type of which was recently redescribed by Van- derHoof (1936). In 0. hilli J3, C. P \ and M1 are powerfully developed. It is not possible to tell from the alveolus whether P 1 was double or single rooted. P 2 and P 3 are double rooted, however, and are so crowded that they are placed somewhat transversally in the jaw. These teeth are small and poorly developed with a very low central cusp. The parastyle on P4 is present, but vestigial. There is no anterior internal cusp on this tooth, though the root at this point is well developed. There is no trace of a cingulum on either P4 or M1 as is true in 0. cyonoides. In the following tables of dental measure- ments 0. hilli is shown in comparison to 0. cyonoides and B.diversidens. The figures for the two latter species are maxima taken from a number of specimens. The material representing B. diversidens was collected in the Cita Canyon Type Locality, referred to in a preliminary report by Johnston (1938).
Comparison of 0. hilli with 0. cyonoides and B. diversidens. Measurements are expressed in millimeters. |
Measurements
No measurements are available
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| Source: g = genus, f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Van Valkenburgh 1988, Lillegraven 1979, Ji et al. 2002, Carroll 1988, Nowak 1991, Hendy et al. 2009 | |||||
Age range: base of the Hemphillian to the top of the Zanclean or 9.40000 to 3.60000 Ma
Collections (17 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hemphillian | USA (Florida) | Borophagus hilli (18527 200705) Osteoborus dudleyi (18502) | |
| Late/Upper Hemphillian | USA (Texas) | Borophagus hilli (type locality: 18036 18093) | |
| Late/Upper Hemphillian | USA (Florida) | Borophagus hilli (18513 18532 18533 18595) | |
| Late/Upper Hemphillian - Zanclean | USA (Florida) | Borophagus hilli (18535) | |
| Blancan | USA (Kansas) | Osteoborus progressus (19922) | |
| Blancan | USA (Washington) | Borophagus sp. (20063) | |
| Blancan | USA (South Carolina) | Borophagus hilli (178479) | |
| Blancan | USA (New Mexico) | Borophagus diversidens (19974) | |
| Blancan | El Salvador | Borophagus hilli (107827) | |
| Blancan | USA (Idaho) | Borophaginae indet. (19808) | |
| Blancan | Mexico (Baja California Sur) | Borophagus diversidens (19673) |