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Pliolemmus antiquus

Mammalia - Rodentia - Cricetidae

Taxonomy
Pliolemmus antiquus was named by Hibbard (1937) [genotype; also said to be 1938]. It is a 3D body fossil. Its type locality is Deer Park, which is in a Blancan terrestrial horizon in the Ballard Formation of Kansas.

Synonymy list
YearName and author
1937Pliolemmus antiquus Hibbard
1980Pliolemmus antiquus Kurten and Anderson p. 258

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
Therapsida()
RankNameAuthor
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
EuarchontogliresMurphy et al. 2001
Glires()
orderRodentia
infraorderMyodontaSchaub 1958
superfamilyMuroideaIlliger 1811
familyCricetidaeFischer von Waldheim 1817
subfamilyMicrotinae
genusPliolemmusHibbard 1937
speciesantiquus

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.

Diagnosis
ReferenceDiagnosis
C. W. Hibbard 1937Intermediate in size between Sigmodon curtisi and Sigmodon medius. Distinguished from other fossil and living forms in that the anterior internal lophid of M2 is not as compressed and transversely elongated. Anterior to the posterior loop of M2 and on the lingual side of the tooth is found an enamel islet. In young specimens this islet is represented by a well-developed reëntrant fold, but not deep enough to persist through the wearing life of the crown; a distinctive character of this form. The anteroposterior diameter of this lophid is nearly as great as its transverse diameter due to the angulation of the antero-external portion of this tooth. The anterior loop of M1 large. The antero-interior lophid of M1 opens widely into the anterior loop.