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Yumaceras
Taxonomy
Yumaceras was named by Frick (1937). Its type is Yumaceras figginsi.
It was synonymized subjectively with Pediomeryx by Savage (1941), Janis and Manning (1998); it was reranked as Pediomeryx (Yumaceras) by Webb (1983); it was synonymized subjectively with Cranioceras by Tedford et al. (1987).
It was assigned to Pediomeryx by Webb (1983); and to Cranioceratini by Prothero and Liter (2007), Prothero and Liter (2008).
It was synonymized subjectively with Pediomeryx by Savage (1941), Janis and Manning (1998); it was reranked as Pediomeryx (Yumaceras) by Webb (1983); it was synonymized subjectively with Cranioceras by Tedford et al. (1987).
It was assigned to Pediomeryx by Webb (1983); and to Cranioceratini by Prothero and Liter (2007), Prothero and Liter (2008).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1937 | Yumaceras Frick |
| 1983 | Pediomeryx (Yumaceras) Webb |
| 2007 | Yumaceras Prothero and Liter p. 248 |
| 2008 | Yumaceras Prothero and Liter |
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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.
G. †Yumaceras Frick 1937
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†Yumaceras figginsi Frick 1937
†Yumaceras hamiltoni Webb 1983
†Yumaceras ruminalis Stirton 1939
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. R. Prothero and M. R. Liter 2008 | Long, nearly vertical supraorbital horns with retrocurved and anteriorly flattened tips, and round midshaft section. Occipital appendage longer than in Cranioceras, and rising more verti- cally, with more anteroposteriorly flattened tip. No upper canine. Di- astema moderate. Mandible with nearly straight ventral border. Premolar row reduced, with p2 greatly reduced; p4 closed lingually by long meta- conid. Mesodont molars without Palaeomeryx fold (modified from Janis and Manning, 1998, p. 486). |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Janis and Manning 1998, Hendy et al. 2009, Lillegraven 1979, Nowak 1999 | |||||
Age range: base of the Late/Upper Clarendonian to the top of the Miocene or 12.50000 to 5.33300 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Miocene | USA (California) | Pediomeryx ruminalis (19459) | |
| Late/Upper Clarendonian | USA (Florida) | Y. sp. (18554) | |
| Hemphillian | USA (Texas) | Pediomeryx figginsi (18072 18198) | |
| Hemphillian | USA (Florida) | Pediomeryx hamiltoni (18563 26549) | |
| Hemphillian | USA (Colorado) | Y. figginsi (18495) | |
| Hemphillian | USA (Oklahoma) | Pediomeryx figginsi (18034) | |
| Hemphillian | USA (Nebraska) | Pediomeryx figginsi (18086) | |
| early Early Hemphillian - late Early Hemphillian | USA (Florida) | Pediomeryx sp. (18539) |