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Dyseohyus fricki
Taxonomy
Dyseohyus fricki was named by Stock (1937) [genotype]. Its type specimen is CIT 2039, a partial skull (a fragmentary skull and lower jaw with C, deciduous and permanent upper premolars, M1 to M3, and P2-P4., M2 and 3), and it is a 3D body fossil. Its type locality is Barstow (CIT 288), which is in a Barstovian terrestrial horizon in the Barstow Formation of California.
Synonymy list
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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.
†Dyseohyus fricki Stock 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Stock 1937 | Rostral portion of skull slender and elongate; diastema between C and P~ similar in length to length of premolar series P2-P4 inclusive. Orbit situated not so far back as in Prosthennops crassigenis, but farther back than in Desmathyus siouxensis. Cranial length (as measured from level of posterior ends of third molars to posterior side of occipital condyles) similar to length of cheek-tooth series P2-M3, inclusive. Palate extends behind M3 for a distance slightly greater than length of third molar. Dentition ?/?, 1/1, 3/3, 3/3. In stage of acquisition of molar pattern, the premolars, particularly P4, are more advanced than in Desmathyus, less so than in Prosthennops. Crowns of molar teeth with inner cuspules and crenulations better developed than in Prosthennops. Lower premolars narrower and less molariform than in Prosthennops,re- sembling in their characters the comparable teeth in Desmathyus. P4 with shorter heel than in latter genus. | |
| M. O. Woodburne 1969 | Differs from D. stirtoni, new species, in the following features: dorsal surface of nasals flat; anterior palatine foramina opposite anterior tip of M1; palate extending posteriorly midway between M" and glenoid fossa; weak separation of parametacone of P4; upper molars short, wide; dP3 and dP4 small, dP4 irregularly narrowed anteriorly; P4 small, relatively brachyodont; lower molars relatively short; genial spine present on symphysis; ventral surface of mandible smooth below canines. |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1991, Hendy et al. 2009, Nowak 1999, Lillegraven 1979, Carroll 1988 | |||||
Age range: Barstovian or 16.30000 to 12.50000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Barstovian | USA (California) | Dyseohyus fricki (type locality: 19152 19176 19364 19557) | |
| Early/Lower Barstovian | USA (California) | Dyseohyus fricki (93107) |