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Mimomys meadensis
Taxonomy
Pliophenacomys meadensis was named by Hibbard (1956). Its type specimen is UMMP 32019, a mandible (sin with m1, m2), and it is a 3D body fossil. Its type locality is Sanders (UM-K2-53), which is in a Blancan terrestrial horizon in the Ballard Formation of Kansas.
It was recombined as Ophiomys meadensis by Hibbard and Zakrzewski (1967), Kurten and Anderson (1980), Barnosky (1985), Martin et al. (2002); it was recombined as Mimomys meadensis by Repenning (1987), Repenning (2003).
It was recombined as Ophiomys meadensis by Hibbard and Zakrzewski (1967), Kurten and Anderson (1980), Barnosky (1985), Martin et al. (2002); it was recombined as Mimomys meadensis by Repenning (1987), Repenning (2003).
Sister species lacking formal opinion data
M. altenbergensis, M. arvalinus, M. burgondiae, M. cappettai, M. coelodus, M. exilis, M. fejervaryi, M. gracilis, M. hajnackensis, M. haplodentatus, M. hassiacus, M. hintoni, M. hungaricus, M. intermedius, M. ischus, M. kislangensis, M. lagurodontoides, M. medasensis, M. mehelyi, M. minor, M. moldavicus, M. newtoni, M. obtusus, M. orientalis, M. ostramosensis, M. ostramosi, M. oswaldoreigi, M. peii, M. petenyii, M. pitymyoides, M. polonicus, M. praehungaricus, M. praepliocaenicus, M. pseudintermedius, M. pusillus, M. realensis, M. reidi, M. rex, M. rhabonensis, M. savini, M. septimanus, M. simplex, M. stehlini, M. stehlinihintoni, M. tanaitica, M. tigliensis, M. tornensis, M. gracilis, M. stehlini, M. rex, M. intermedius, M. pusillus, M. hajnackensis, M. hassiacus, M. haplodentatus
Entered
by J. Alroy on 2003-01-23
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Pliophenacomys meadensis Hibbard |
| 1967 | Ophiomys meadensis Hibbard and Zakrzewski |
| 1980 | Ophiomys meadensis Kurten and Anderson p. 255 |
| 1985 | Ophiomys meadensis Barnosky |
| 1987 | Mimomys meadensis Repenning |
| 2002 | Ophiomys meadensis Martin et al. |
| 2003 | Mimomys meadensis Repenning p. 489 figs. Figures 17.5G, H and 17.7A, B, C, D, E, F |
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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.
†Mimomys meadensis Hibbard 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Hibbard 1956 | Pliophenacomys meadensis is larger tha P. primaevus Hibbard and P. parvus (Wilson). The mental foramen is not so dorsal as in P. primaevus, and the capsular process for the base of the incisor on the coronoid process of the ascending ramus is better developed. The number of roots of M2 varies from two to three; M3 is two-rooted. In P. primaevus M2 has three roots, and M3 generally has two, although three roots are sometimes present. The posterior loop of the M3 in P. meadensis is more hook-shaped, like that of P. parvus (Wilson), than the posterior loop in P. primaevus, which is rounded. | |
| C. A. Repenning 2003 | Diagnosis of intermediate and morphologically transitional forms, named or otherwise, is difficult because they include a series of morphologic gradations. The oldest forms (in this case those from Sand Point, Idaho, Taunton, Washington, and possibly Duncan, Arizona) are more like the ancestral form (M. taylori from Hagerman). The youn- ger forms from later faunas (Flatiron Butte and earliest Blancan V faunas, Ninefoot Rap- ids, Poison Creek, and Birch Creek, all in the Glenns Ferry Formation of Idaho, and ‘‘O. fricki’’ with ‘‘O. magilli’’ from the Sand Draw faunas of Nebraska and the type Mi- momys meadensis from the Sanders fauna of Kansas) are much more like the descendant Ophiomys parvus from Jackass Butte, Idaho, and Dixon, Kansas. All morphotypes are in- cluded in the ‘‘transitional’’ species M. meadensis in the northern part of the WFR, but similar forms have been assigned to sep- arate species in the EFR.
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Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1999, Hendy et al. 2009, Lillegraven 1979, Carroll 1988, Ji et al. 2002 | |||||
Age range: Blancan or 4.70000 to 1.40000 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Blancan | USA (Kansas) | Ophiomys meadensis (19941 19942 19943 19944) Pliophenacomys meadensis (19933 type locality: 19938) | |
| Blancan | USA (Wyoming) | Mimomys meadensis (20065 20066 20067) | |
| Blancan | USA (Idaho) | Mimomys meadensis (19917) |