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Acaremys
Taxonomy
Acaremys was named by Ameghino (1887).
It was assigned to Cercolabidae by Ameghino (1891) and Ameghino (1894); to Octodontidae by McKenna and Bell (1997); to Octodontinae by Verzi et al. (2014); and to Acaremyidae by Kramarz (2004), Vucetich et al. (2010), Arnal and Vucetich (2015) and Arnal and Vucetich (2015).
It was assigned to Cercolabidae by Ameghino (1891) and Ameghino (1894); to Octodontidae by McKenna and Bell (1997); to Octodontinae by Verzi et al. (2014); and to Acaremyidae by Kramarz (2004), Vucetich et al. (2010), Arnal and Vucetich (2015) and Arnal and Vucetich (2015).
Synonymy list
| Year | Name and author |
|---|---|
| 1887 | Acaremys Ameghino |
| 1891 | Acaremys Ameghino p. 13 |
| 1894 | Acaremys Ameghino p. 67 |
| 1997 | Acaremys McKenna and Bell |
| 2004 | Acaremys Kramarz pp. 200-203 |
| 2010 | Acaremys Vucetich et al. |
| 2014 | Acaremys Verzi et al. |
| 2015 | Acaremys Arnal and Vucetich |
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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. †Acaremys Ameghino 1887
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†Acaremys major Scott 1905
†Acaremys messor Ameghino 1889
†Acaremys minutissimus Ameghino 1887
†Acaremys preminutus Bordas 1939
†Acaremys scagliai Patterson 1971
†Acaremys tricarinatus Ameghino 1894
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Arnal and M. Vucetich 2015 | Small- to medium-sized octodon- toid. Teeth higher crowned than Platypittamys and lower crowned than Sciamys. Presence of unilateral hypsodonty, less evident than in Sciamys. Cusp individualised only in juvenile specimens. Parallel upper tooth rows, as in Sciamys and Platypittamys. Premolars normally replaced. Upper premolar with a poorly developed hypoflexus, unlike Sciamys, and absent or reduced metaloph. The lower premolar has a flexid separating protoconid and metaconid, deeper than in Sciamys. Lower molars with long posterolophid, unlike Platypittamys and Galileomys. Notch for the insertion of the Mmmpio conspicuous. The anterior portion of the mandibular masseteric fossa is deeper than in Sciamys. Masseteric fossa of the skull broad and limited anteriorly by an evident rim; nasals with a foramen of uncertain homologies located at the midpoint of the antero-posterior length of the bone; postorbital process well developed and presence of sagittal crest, unlike Sciamys. |
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, Nowak 1999, Hendy et al. 2009 | |||||
Age range: base of the Burdigalian to the top of the Santacrucian or 20.44000 to 16.30000 Ma
Collections (19 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Colhuehuapian | Argentina (Chubut) | A. murinus (141368) A. preminutus (27311 145897) | |
| Burdigalian | Argentina (Chubut) | A. sp. (176205) | |
| Santacrucian | Argentina (Santa Cruz) | A. major (176590) A. murinus (142533 176563 176589 210638) A. murinus, A. karaikensis (176596) A. murinus, A. messor, A. tricarinatus (176593) A. murinus, A. tricarinatus (176570) A. sp. (59324 59333 59334 176571 176622 210787) A. tricarinatus (176620) |