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Acaremys tricarinatus

Mammalia - Rodentia - Acaremyidae

Taxonomy
Acaremys tricarinatus was named by Ameghino (1894). Its type specimen is MACN A 4113, a mandible (right and left dentary with right and left p4-m3), and it is a 3D body fossil. Its type locality is Cerro Observatorio, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.

Synonymy list
YearName and author
1894Acaremys tricarinatus Ameghino p. 68
2015Acaremys tricarinatus Arnal and Vucetich

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
RankNameAuthor
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentiaBowdich 1821
—CtenohystricaHuchon et al. 2000
infraorderHystricognathi(Tullberg 1899)
—Caviomorpha(Wood and Patterson 1955)
superfamilyOctodontoideaWaterhouse 1839
familyAcaremyidae(Wood 1949)
genusAcaremysAmeghino 1887
speciestricarinatus

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.

†Acaremys tricarinatus Ameghino 1894
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Diagnosis
ReferenceDiagnosis
M. Arnal and M. Vucetich 2015(Autapomorphies marked with asterisk) Size similar to
Acaremys murinus. Cheek teeth higher crowned than in the remaining species of Acaremys, as in the species of Sciamys; *p4 with a flexid separating the metalophulid I from the protoconid; metaconid anteriorly placed with respect to protoconid; hypolophid conspicuous and *posterolophid not connected to the entoconid, unlike the species of Acaremys; m1–m3 with the anterior lobe wider labio-lingually and antero-posteriorly shorter than the posterior lobe, unlike other acaremyids; *mandible without contact between the notch for insertion of the Mmmpio and masseteric crest, and anterior portion of the masseteric fossa shallower than in the remaining species of Acaremys, as in the species of Sciamys.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingo
Diet: herbivoreo
Reproduction: viviparoussubc
Created: 2005-08-26 14:04:46
Modified: 2005-08-26 16:04:46
Source: o = order, subc = subclass, c = class, subp = subphylum
References: Nowak 1999, Hendy et al. 2009, Ji et al. 2002, Lillegraven 1979, Carroll 1988

Age range: Santacrucian or 17.50000 to 16.30000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Santacrucian17.5 - 16.3Argentina (Santa Cruz) Acaremys tricarinatus (type locality: 176570 176593 176620)