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Taxonomy
Oxydactylus gibbi was named by Loomis (1911). Its type specimen is YPM 10328, a partial skull (the palate and lower jaws with complete dentition, except that the third molar is lacking in each jaw), and it is a 3D body fossil. Its type locality is Big Muddy Creek, which is in an Arikareean terrestrial horizon in Wyoming.
It was recombined as Miotylopus gibbi by McKenna (1966), McKenna and Love (1972), Prothero (1996) and Honey et al. (1998).
It was recombined as Miotylopus gibbi by McKenna (1966), McKenna and Love (1972), Prothero (1996) and Honey et al. (1998).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1911 | Oxydactylus gibbi Loomis |
| 1935 | Miotylopus bathygnathus Schlaikjer p. 174 |
| 1935 | Dyseotylopus migrans Stock p. 121 fig. 1 |
| 1966 | Miotylopus gibbi McKenna p. 6 |
| 1972 | Miotylopus gibbi McKenna and Love |
| 1987 | Dyseotylopus migrans Tedford et al. |
| 1996 | Miotylopus gibbi Prothero p. 638 figs. Figures 15-16, Tables 2, 3, 5 |
| 1998 | Miotylopus gibbi Honey et al. p. 444 |
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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.
†Miotylopus gibbi Loomis 1911
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Invalid names: Dyseotylopus migrans Stock 1935 [synonym], Miotylopus bathygnathus Schlaikjer 1935 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Stock 1935 (Dyseotylopus migrans) | Larger than known species of Prebrotherium, but similar to this genus in slenderness of skull. Maxillary fossa broad. Molars compressed transversely and higher crowned than in Prebrotherium or in Paratylopus. Outer walls of molars flatter and styles distinctly less prominent than in these genera. Mesostyle present, but does not extend full depth of crown. | |
| E. M. Schlaikjer 1935 (Miotylopus bathygnathus) | Inferior premolars simple. P1 separated from the canine by a long diastema which is subequal to that which separates Pi from P2. Styles on inner walls of inferior molars absent or feebly developed. Ramus narrow and relatively deep. Infraorbital foramen above the paracone of M . Interorbital breadth across frontals very
great. (See Plate 39). | |
| D. R. Prothero 1996 | Medium-sized species of Miotylopus. Length of P2-M3 = 71-79 mm. M3 more elongate relative to the size of the animal than in any other
species of Miotylopus |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Hendy et al. 2009, Nowak 1999, Nowak 1991, Carroll 1988 | |||||
Age range: base of the Monroecreekian to the top of the Harrisonian or 26.30000 to 18.50000 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Whitneyan - late Early Arikareean | USA (California) | Dyseotylopus migrans (17527) | |
| Arikareean | USA (Nebraska) | Miotylopus brachygnathus (17602) | |
| Arikareean | USA (Wyoming) | Miotylopus bathygnathus (17667) Miotylopus gibbi (17490 17532) Oxydactylus gibbi (type locality: 17472) | |
| Monroecreekian | USA (Nebraska) | Miotylopus gibbi (17565) | |
| Harrisonian | USA (Wyoming) | Miotylopus gibbi (17813) |