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Acaremys major

Mammalia - Rodentia - Acaremyidae

Taxonomy
Acaremys major was named by Scott (1905). Its type specimen is YPM PU 15366, a skull (badly preserved skull with incisors, and left and right p4–m3.), and it is a 3D body fossil. Its type locality is Río Gallegos, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.

Synonymy list
YearName and author
1905Acaremys major Scott
2015Acaremys major 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
speciesmajorScott 1905

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 major Scott 1905
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Diagnosis
ReferenceDiagnosis
M. Arnal and M. Vucetich 2015(Autapomorphies marked with asterisk) It is one of the largest fossil octodontoids, being 15% larger than Acaremys murinus. P4 and M1 are smaller than M2 and M3 in adult specimens, unlike other acaremyids in which M1 and M2 are the largest teeth. *M3 and M2 are similar in size. Labial shortening of the hypoloph and posteroloph on M3. Molariforms and incisors with a thin enamel layer, compared with other species of Acaremys and Sciamys. Skull with sagittal crest.
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: Ji et al. 2002, Carroll 1988, Lillegraven 1979, Nowak 1999, Hendy et al. 2009

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 major (type locality: 176590)