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Peromyscus brachygnathus

Mammalia - Rodentia - Cricetidae

Taxonomy
Peromyscus brachygnathus was named by Gidley (1922) [Curtis locality]. Its type specimen is USNM 10501, a mandible (The greater portion of a right lower jaw carrying all the teeth), and it is a 3D body fossil.

It was recombined as Baiomys brachygnathus by Hibbard (1941) and Kurten and Anderson (1980).

Synonymy list
YearName and author
1922Peromyscus brachygnathus Gidley p. 124 figs. pl.34, fig.12
1941Baiomys brachygnathus Hibbard
1980Baiomys brachygnathus Kurten and Anderson p. 248

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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
subfamilyCricetinaeFischer von Waldheim 1817
genusPeromyscusGloger 1841
speciesbrachygnathus

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
J. W. Gidley 1922Length of cheek-tooth series, 2.8 millimeters; about the size of P. taylori; jaw relatively short anterior to cheek teeth; last molar very much reduced, as much as in any living species of Onychomys. the teeth are too much worn to determine accurately their normal height in unworn condition, but they appear to be of the depressed type of P. taylori. The form and position of the anterior extension of the masseteric ridge, the general chracter of the coronoid region, and the relatively broadly expanded anterior lobe of the anterior cheek tooth seem to determine the generic reference of this species, but it differs from all living species of the genus in the relatively short jaw and the greater reduction of the last lower cheek tooth, which seems to have nearly or quite lost its hinder lobe.
C. W. Hibbard 1941Lenght of cheek-tooth series, 2.5 millimeters; about the size of P. taylori jaw relatively short anterior to cheek teeth last molar very much reduced, as much as in any living species of Onychomys. The teeth are too much worn to determine accerately their normal height in unworn condition, but they appear to be of the depressed type of P. taylori. The form and position of the anterior extension of the massetric ridge, the general character of the coronoid region, and the relatively broadly expanded lobe of the anterior cheek tooth seem to determine the generic reference of species, but it differs from all living species of the genus in the relatively short jaw and greater reduction of last lower cheek tooth, wich seems to have nearly og quite lost its hinder lobe.