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Taxonomy
Michenia was named by Frick and Taylor (1971). It is not extant. Its type is Michenia agatensis.
It was assigned to Camelidae by Carroll (1988); to Protolabidini by Frick and Taylor (1971) and Dingus (1990); and to Protolabinae by Honey et al. (1998), Pagnac (2005) and Honey (2007).
It was assigned to Camelidae by Carroll (1988); to Protolabidini by Frick and Taylor (1971) and Dingus (1990); and to Protolabinae by Honey et al. (1998), Pagnac (2005) and Honey (2007).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1971 | Michenia Frick and Taylor |
| 1988 | Michenia Carroll |
| 1990 | Michenia Dingus p. 13 |
| 1998 | Michenia Honey et al. p. 446 |
| 2005 | Michenia Pagnac |
| 2007 | Michenia Honey p. 188 |
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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. †Michenia Frick and Taylor 1971
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†Michenia agatensis Frick and Taylor 1971
†Michenia deschutensis Dingus 1990
†Michenia exilis Matthew and Macdonald 1960
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Invalid names: Michenia australis Stevens 1977 [synonym]
†Michenia mudhillsensis Pagnac 2005
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Frick and B. E. Taylor 1971 | Michenia differs from Protolabis by its smaller size; much narrower muzzle; weaker and more incisiform I13 and upper canine; P2-3 relatively larger and les laterally compressed with more distinct
cusps; lower-crowned molars with stronger vertical ribs on the paracone and metacone and more prominent metastylids; les anteroposteriorly expanded M3; shallower symphysis, which is conspicuously unlike the deep and more ventrally produced symphysis in Protolabis; shallower horizontal ramus; and proportionally longer and slenderer metapodials. In Michenia the metapodials are les solidly fused than in Protolabis and both metacarpus and metatarsus have a deeper groove along the line of fusion. Moreover, the anterodistal separation of the distal ends of both the metacarpus and the metatarsus extends proximally farther up the shaft in Michenia than in Protolabis. The length of the metacarpus in Michenia exceeds the basal length of the skull and is slightly longer than the metatarsus. This difference in length is reversed in Protolabis, with the length ofthe metacarpus lesthan either the basal length of the skull or the length of the metatarsus. |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1999, Carroll 1988, Hendy et al. 2009, Nowak 1991, Lillegraven 1979 | |||||
Age range: base of the Early/Lower Hemingfordian to the top of the Early/Lower Clarendonian or 20.43000 to 9.40000 Ma
Collections (33 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Arikareean | USA (Texas) | M. australis (178058) | |
| Arikareean | USA (Oregon) | M. deschutensis (188964) | |
| Arikareean | USA (California) | M. agatensis (17800) | |
| late Late Arikareean | USA (California) | M. agatensis (167826 167853) | |
| Harrisonian | USA (South Dakota) | Oxydactylus exilis (17745) | |
| Harrisonian | USA (Texas) | M. australis (17767 17769 17776) | |
| Harrisonian | USA (Nebraska) | M. agatensis (17738) M. sp. (17805 28043) | |
| Miocene | USA (Idaho) | M. sp. (18980) | |
| Early/Lower Hemingfordian | USA (California) | M. agatensis (167840 167841) Paratylopus primaevus (17762) | |
| Early/Lower Hemingfordian | USA (New Mexico) | M. sp. (19388) | |
| Early/Lower Hemingfordian | USA (Nebraska) | M. sp. (17865) | |
| Early/Lower Hemingfordian | USA (Wyoming) | M. sp. (167862) | |
| Hemingfordian | USA (Nebraska) | M. sp. (17915) | |
| Hemingfordian | Canada (Saskatchewan) | M. sp. (17870 18003) | |
| Late/Upper Hemingfordian | USA (California) | M. sp. (19369) | |
| Barstovian | USA (New Mexico) | M. sp. (19287 19449 19535) | |
| Barstovian | USA (California) | M. mudhillsensis (19356) M. sp. (19510) | |
| Early/Lower Barstovian | USA (New Mexico) | M. sp. (19547) | |
| Barstovian - Early/Lower Clarendonian | USA (New Mexico) | M. sp. (19286) | |
| Clarendonian | USA (California) | M. sp. (19145) | |
| Late/Upper Clarendonian | USA (New Mexico) | M. sp. (19528) | |
| Late/Upper Miocene | USA (Colorado) | M. sp. (18846) |