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Entoptychus
Taxonomy
Entoptychus was named by Cope (1878). Its type is Entoptychus cavifrons.
It was assigned to Saccomyidae by Cope (1878) and Cope (1879); to Entoptychinae by Korth (1996); and to Geomyidae by Hay (1902) and McKenna and Bell (1997).
It was assigned to Saccomyidae by Cope (1878) and Cope (1879); to Entoptychinae by Korth (1996); and to Geomyidae by Hay (1902) and McKenna and Bell (1997).
Species
E. basilaris, E. cavifrons (type species), E. crassiramis, E. fieldsi, E. germannorum, E. grandiplanus, E. individens, E. lambdoideus, E. leptophrys, E. minor, E. montanensis, E. planifrons, E. productidens, E. rensbergeri, E. rostratus, E. sheppardi, E. sperryi, E. transitorius, E. wheelerensis, Palustrimus lewisi
Synonyms
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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.
G. †Entoptychus Cope 1878
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†Entoptychus basilaris Rensberger 1971
†Entoptychus cavifrons Cope 1878
†Entoptychus crassiramis Cope 1878
†Entoptychus fieldsi Nichols 1976
†Entoptychus germannorum Wood 1936
†Entoptychus grandiplanus Korth 1992
†Entoptychus individens Rensberger 1971
†Entoptychus lambdoideus Cope 1881
†Entoptychus leptophrys Cope 1881
†Entoptychus minor Cope 1881
†Entoptychus montanensis Hibbard and Keenmon 1951
†Entoptychus planifrons Cope 1878
†Entoptychus productidens Rensberger 1971
†Entoptychus rensbergeri Korth and Kron 2020
†Entoptychus rostratus Sinclair 1905
†Entoptychus sheppardi Nichols 1976
†Entoptychus sperryi Sinclair 1905
†Entoptychus transitorius Rensberger 1971
†Entoptychus wheelerensis Rensberger 1971
Invalid names: Palustrimus Wood 1935 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. D. Cope 1878 | Molars -4 , rootless, and identical in structure. The crowns are prismatic, and in the young stage present a deep inflection of enamel from one side, the external in thlesuperior teeth, the internal in the inferior. After a little attrition, the connection with the external enamel layer disappears, and there remains a median transverse fossette, entirely enclosed by enamel. The tooth then consists of two dentinal columns in one cylinder of enamel, separated by a transverse enamel-bordered tube.
Incisors not sulcate. The teeth of this genus differ from those of Perognathus in being with- out distinct roots, and in having the enamel loop cut off and enclosed. In Dipodomys, the molars are undivided simple prisms. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1999, Ji et al. 2002, Lillegraven 1979, Hendy et al. 2009, Carroll 1988 | |||||
Age range: base of the Chattian to the top of the Harrisonian or 28.10000 to 18.50000 Ma
Collections (24 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Geringian | USA (South Dakota) | E. minor (17644) | |
| Arikareean | USA (Idaho) | E. fieldsi (17584) E. sheppardi (17585) | |
| Arikareean | USA (Wyoming) | Palustrimus sp. (17582) | |
| Arikareean | USA (Oregon) | E. cavifrons, E. crassiramis, E. planifrons (180202) E. planifrons (170311) E. sp. (170309) E. spp. (212628) E. wheelerensis (93080) | |
| early Late Arikareean | USA (Oregon) | E. individens (36853) | |
| late Late Arikareean | USA (Oregon) | E. individens (18013) | |
| Chattian | USA (Oregon) | E. sp. (17603 93079) | |
| Monroecreekian - Harrisonian | USA (Oregon) | E. wheelerensis (17528) | |
| Harrisonian | USA (Nebraska) | E. grandiplanus (17802 17816 17843 67638 69806) | |
| Harrisonian | USA (South Dakota) | E. sp. (17746) Pleurolicus leptophrys (17749 17825) | |
| Harrisonian | USA (Montana) | Gregorymys montanensis (17761) | |
| Early/Lower Hemingfordian | USA (Oregon) | E. individens, E. rostratus (17925) |