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Pseudocylindrodon
Taxonomy
Pseudocylindrodon was named by Burke (1935). Its type is Pseudocylindrodon neglectus.
It was assigned to Cylindrodontidae by Burke (1935), McKenna and Bell (1997); and to Cylindrodontinae by Korth and Tabrum (2016).
It was assigned to Cylindrodontidae by Burke (1935), McKenna and Bell (1997); and to Cylindrodontinae by Korth and Tabrum (2016).
Species
Species lacking formal opinion data
Entered
by J. Alroy on 2003-01-23; modified by J. Marcot on 2026-05-11
Synonymy list
| Year | Name and author |
|---|---|
| 1935 | Pseudocylindrodon Burke p. 1 |
| 1997 | Pseudocylindrodon McKenna and Bell |
| 2016 | Pseudocylindrodon Korth and Tabrum pp. 77 - 78 figs. Fig. 1; Table 1 |
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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. †Pseudocylindrodon Burke 1935
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†Pseudocylindrodon citofluminis Storer 1984
†Pseudocylindrodon lateriviae Storer 1988
†Pseudocylindrodon neglectus Burke 1935
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Invalid names: Pseudocylindrodon sylvaticus Russell 1954 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. J. Burke 1935 | Cheek teeth with lower crowns than those of Cylindrodon, and with shallower basins, the floors of which are visible in crown view. P4 with trigonid more elevated than in Cylindrodon and trigonid cusps less widely separated, protolophid absent or merely indicated, external intermediate cuspule present but hypolophid absent. Inferior molars with central basins broader, anterior and posterior basins narrower, antero-posteriorly, than in Cylindrodon', internal intermediate cuspules prominent, their flanks fused with entoconids and metaconids, blocking outlets of central basins; posterior basins converted into fossettes, their outlets dammed due to complete fusion of entoconids and hypolophulid crests. Talonids of molars, except in M3, wider, relative to trigonids, than in Cylindrodon\ hypoconids showing some hypertrophy, consisting of strong rounded buttresses, jutting externally (except in M3) and not attenuate as in Cylindrodon. DP4 relatively smaller than in Cylindrodon. Mental foramina two, placed posterior to diastema. | |
| W. W. Korth and A. R. Tabrum 2016 | P3 present; two mental foram- ina ventral to p4 on dentary; incisors longer than wide in cross-section; cheek teeth mesodont; p4 lacking hypolo- phid; metalophulid II on lower cheek teeth weak or absent; incisive foramina similar in size to those of Cylindrodon Douglass, 1901, and Ardynomys Matthew and Granger, 1925, shorter than in other genera (<50% length of upper diastema); maxillary-premaxillary suture crosses palate at posterior end of incisive foramina; bulbous bony expan- sion on the orbital wall for the base of the upper incisor. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Ji et al. 2002, Carroll 1988, Lillegraven 1979, Hendy et al. 2009, Nowak 1999 | |||||
Age range: base of the Late/Upper Uintan to the top of the Orellan or 45.90000 to 31.80000 Ma
Collections (31 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Uintan | Canada (Saskatchewan) | P. citofluminis (16626) | |
| Late/Upper Uintan | USA (Montana) | P. sp. (16584) | |
| Uintan | USA (Wyoming) | P. sp. (16513 16514 16517 16518) | |
| Duchesnean | USA (Texas) | P. neglectus (16830 16837 16851) | |
| Duchesnean | Canada (Saskatchewan) | P. sp. (16845 16846) | |
| Duchesnean - Chadronian | USA (Montana) | P. sp. (16840) | |
| Late/Upper Eocene | China (Nei Mongol) | P. sp. (77908) | |
| Chadronian | USA (Montana) | P. neglectus (17010) | |
| Chadronian | USA (North Dakota) | P. silvaticus (16991) | |
| Chadronian | USA (Colorado) | P. sp. (16977) | |
| Chadronian | USA (Texas) | P. neglectus (16888 17016) | |
| Chadronian | USA (Wyoming) | P. sp. (16920) | |
| Chadronian | Canada (Saskatchewan) | P. neglectus (16919) P. sp. (16979) | |
| Chadronian | USA (Nebraska) | P. neglectus (16917 16930 16940 17014 17033) | |
| Chadronian | Canada (British Columbia) | P. silvaticus (16983) | |
| Early/Lower Chadronian | USA (Montana) | P. sp. (27245) | |
| Late/Upper Chadronian | Canada (Saskatchewan) | P. neglectus (16981) | |
| Middle Chadronian | Canada (Saskatchewan) | P. neglectus (16928) | |
| Orellan | USA (Montana) | P. sp. (17090) |