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Cephalomys
Taxonomy
Cephalomys was named by Ameghino (1897). Its type is Cephalomys arcidens.
It was assigned to Dasyproctidae by Wood and Patterson (1959), Lavocat (1976) and McKenna and Bell (1997); and to Cephalomyidae by Ameghino (1897), Arnal and Vucetich (2015), Vucetich et al. (2015), Busker and Dozo (2018) and Busker et al. (2020).
It was assigned to Dasyproctidae by Wood and Patterson (1959), Lavocat (1976) and McKenna and Bell (1997); and to Cephalomyidae by Ameghino (1897), Arnal and Vucetich (2015), Vucetich et al. (2015), Busker and Dozo (2018) and Busker et al. (2020).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1897 | Cephalomys Ameghino p. 493 |
| 1897 | Orchiomys Ameghino p. 495 |
| 1959 | Cephalomys Wood and Patterson |
| 1976 | Cephalomys Lavocat |
| 1997 | Cephalomys McKenna and Bell |
| 2015 | Cephalomys Arnal and Vucetich |
| 2015 | Cephalomys Vucetich et al. |
| 2018 | Cephalomys Busker and Dozo |
| 2020 | Cephalomys Busker 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.
G. †Cephalomys Ameghino 1897
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†Cephalomys arcidens Ameghino 1897
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Invalid names: Asteromys annectens Ameghino 1902 [synonym], Asteromys prospicuus Ameghino 1897 [synonym], Cephalomys plexus Ameghino 1897 [synonym], Cephalomys prorsus Ameghino 1902 [synonym], Orchiomys prostans Ameghino 1897 [synonym]
†Cephalomys ceciae Vucetich et al. 2015
Invalid names: Orchiomys Ameghino 1897 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Vucetich et al. 2015 | Teeth high-crowned but rooted, with unilateral hypsodonty, particularly in upper molars; no cement on crowns; crown pattern of unworn cheek teeth essentially resembling that of Neoreomys, also basically similar to that of Platypittamys but with P4/4 much more advanced than in the latter; pattern disappearing fairly rapidly with wear, much less persistent than in Neoreomys; enamel interrupted on lingual and anterior sides of lower teeth and buccal and posterior sides of upper teeth after considerable wear (only cheek teeth; Wood and Patterson
1959). |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1999, Carroll 1988, Lillegraven 1979, Ji et al. 2002, Hendy et al. 2009 | |||||
Age range: base of the Late/Upper Oligocene to the top of the Colhuehuapian or 28.40000 to 17.50000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Deseadan | Argentina (Chubut) | C. arcidens (146358) C. arcidens, C. plexus, Asteromys prospicuus, Orchiomys prostans, C. prorsus, Asteromys annectens, C. ceciae, C. prosus (14211) | |
| Deseadan | Argentina (Santa Cruz) | C. arcidens, C. plexus (50074) C. sp. (176626) | |
| Late/Upper Oligocene | Argentina (Mendoza) | C. sp. (220946) | |
| Colhuehuapian | Argentina (Neuquén) | C. arcidens (89027) |