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Acaremys preminutus

Mammalia - Rodentia - Acaremyidae

Taxonomy
Acaremys preminutus was named by Bordas (1939). Its type specimen is MACN PV 11246, a maxilla (right maxillary fragment with DP4-M2), and it is a 3D body fossil. Its type locality is Southern Cliff of lower Chubut River Valley, near Gaiman, which is in a Colhuehuapian paralic mudstone in the Sarmiento Formation of Argentina.

Synonymy list
YearName and author
1939Acaremys preminutus Bordas
2015Acaremys preminutus 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
speciespreminutusBordas 1939

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 preminutus Bordas 1939
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Diagnosis
ReferenceDiagnosis
M. Arnal and M. Vucetich 2015
(Autapomorphies marked with asterisk) Retention of the deciduous premolar unlike acaremyids. Upper cheek teeth longer than wide, unlike Acaremys and Pseudoacaremys. Upper cheek teeth with absence of figure-eight dental pattern, *crests anterolabially–posterolingually oblique and *anterolingual angle of M1–M3 forming a right angle as in Protacaremys prior and unlike acaremyids. M2 longer than wide * unlike acaremyids.
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: Hendy et al. 2009, Nowak 1999, Carroll 1988, Lillegraven 1979, Ji et al. 2002

Age range: Colhuehuapian or 21.00000 to 17.50000 Ma

Collections (2 total)


Time interval Ma Country or state Original ID and collection number
Colhuehuapian21.0 - 17.5Argentina (Chubut) Acaremys preminutus (type locality: 27311 145897)