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Entoptychus cavifrons

Mammalia - Rodentia - Entoptychidae

Taxonomy
Entoptychus cavifrons was named by Cope (1878) [genotype]. It is the type species of Entoptychus.

Synonymy list
YearName and author
1878Entoptychus cavifrons Cope p. 64
1902Entoptychus cavifrons Hay p. 731

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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
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentiaBowdich 1821
familyEntoptychidae(Miller and Gidley 1918)
genusEntoptychus
speciescavifrons

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.

†Entoptychus cavifrons Cope 1878
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Diagnosis
ReferenceDiagnosis
E. D. Cope 1878This species is represented by some entire crania, and numerous separated jaws. The postorbital part of the skull is subquadrate in outline, and depressed in form. The interorbital region is narrowed, but the superciliary margins do not meet nor converge to form a sagittal crest. They are thickened, forming two subparallel ridges which are sepa- rated by a slhallow concavity of the frontal bone. The nasal bones are very narrow, and their posterior apices just attain the line of the supero-anterior angle of the orbit. The base of the malar bone is much elevated and very oblique. The molar teeth are directed obliquely backwards, tlle alveolus of the first issuing below the anterior part of the orbit. The first superior molar is the largest, and the proportions of the others diminish regularly posteriorly. The first inferior molar is a little smaller than the second and third, and is about equal to the fourth. Its anterior column is contracted, while the last molar is like the second and tllird. The face of the inferior incisor is flat, and its enamel is smooth. The external fiaceof the jaw is bounded below by a strong angle, as far anteriorly as below the first molar.
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, Ji et al. 2002, Lillegraven 1979, Hendy et al. 2009, Carroll 1988

Age range: Arikareean or 29.50000 to 18.50000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Arikareean29.5 - 18.5USA (Oregon) Entoptychus cavifrons (180202)