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Acaremys messor

Mammalia - Rodentia - Acaremyidae

Taxonomy
Acaremys messor was named by Ameghino (1889). Its type specimen is MACN A 4106, a mandible (right mandible with dp4-m3), and it is a 3D body fossil. Its type locality is Barrancas del Río Santa Cruz, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.

Synonymy list
YearName and author
1889Acaremys messor Ameghino p. 126
1894Acaremys messor Ameghino p. 68
2015Acaremys messor 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
speciesmessor

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 messor Ameghino 1889
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Diagnosis
ReferenceDiagnosis
M. Arnal and M. Vucetich 2015(Autapomorphies marked with asterisk) Size a little larger than in Acaremys murinus. Cheek teeth antero-posteriorly longer than labio-lingually wide, unlike the other species of Acaremys. The mandible has three mental foramina unlike other acaremyids, and the *notch for insertion of the Mmmpio at the middle of the mandible height.
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: Lillegraven 1979, Carroll 1988, Ji et al. 2002, Hendy et al. 2009, Nowak 1999

Age range: Santacrucian or 17.50000 to 16.30000 Ma

Collections: one only


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