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Taxonomy
Cynodesmus canavus was named by Simpson (1932). Its type specimen is FSGS V5260, a mandible (right lower jaw with p2 and p4-m2), and it is a 3D body fossil. Its type locality is Thomas Farm, which is in a Hemingfordian terrestrial sandstone/claystone in the Alachua Formation of Florida.
It was recombined as Tomarctus canavus by White (1942), White (1947), Olsen (1956), Olsen (1962), Wang (1994); it was recombined as Metatomarctus canavus by Wang et al. (1999), Wang et al. (2008), Wang and Tedford (2008).
It was recombined as Tomarctus canavus by White (1942), White (1947), Olsen (1956), Olsen (1962), Wang (1994); it was recombined as Metatomarctus canavus by Wang et al. (1999), Wang et al. (2008), Wang and Tedford (2008).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1932 | Cynodesmus canavus Simpson p. 19 fig. 4 |
| 1941 | Tomarctus thomasi White p. 94 figs. pl. XIV, fig. 3 |
| 1942 | Nothocyon insularis White |
| 1942 | Tomarctus canavus White |
| 1947 | Tomarctus canavus White |
| 1956 | Tomarctus canavus Olsen |
| 1962 | Tomarctus canavus Olsen |
| 1994 | Tomarctus canavus Wang p. 63 |
| 1999 | Metatomarctus canavus Wang et al. |
| 2008 | Metatomarctus canavus Wang et al. |
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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.
†Metatomarctus canavus Simpson 1932
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Invalid names: Nothocyon insularis White 1942 [synonym], Tomarctus thomasi White 1941 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. G. Simpson 1932 | A Cynodesmu.s of medium size, about as large as C. thoöides. Lower molar heels well basined, hypoconid and entoconid nearly equal. m1 not so long and narrow as in C. thoöides. m2 relatively large. | |
| T. E. White 1941 (Tomarctus thomasi) | A Tomarctus smaller than T. brevirostris and slightly larger than T. optatus; metaconule of Mt nearly as large as the pro- tocone; postero-external angle of M2 obtuse. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Nowak 1991, Carroll 1988, Lillegraven 1979, Ji et al. 2002 | |||||
Age range: Early/Lower Hemingfordian or 18.50000 to 16.30000 Ma
Collections (25 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Burdigalian | USA (Delaware) | Tomarctus canavus (18579) | |
| Early/Lower Hemingfordian | USA (California) | Metatomarctus canavus (167841) | |
| Early/Lower Hemingfordian | USA (Nebraska) | Metatomarctus canavus (17864 17881 17888 17906 17932 17934 17935 17936 17938 17942 17948 17950 17963 17973 17978 18005 18006) | |
| Early/Lower Hemingfordian | USA (New Mexico) | Metatomarctus canavus (19388) | |
| Hemingfordian | USA (Wyoming) | Tomarctus kelloggi (18948) | |
| Hemingfordian | USA (Florida) | Nothocyon insularis, Tomarctus canavus (type locality: 18597) | |
| Hemingfordian | USA (Nebraska) | Metatomarctus canavus (17896) | |
| Hemingfordian | USA (California) | Tomarctus sp. (19358) | |
| Late/Upper Hemingfordian | USA (Wyoming) | Tomarctus kelloggi (19016) |