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Protospermophilus angusticeps

Mammalia - Rodentia - Sciuridae

Taxonomy
Sciurus angusticeps was named by Matthew (1933). Its type specimen is AMNH 21336, a partial skull ( skull without the left zygomatic arch, third premolars, left M2, and third molars), and it is a 3D body fossil.

It was recombined as Protospermophilus angusticeps by Bryant (1945) and Black (1963).

Synonymy list
YearName and author
1933Sciurus angusticeps Matthew
1945Protospermophilus angusticeps Bryant p. 349
1963Protospermophilus angusticeps Black

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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
superfamilySciuroidea
familySciuridae
genusProtospermophilusGazin 1930
speciesangusticeps(Matthew 1933)

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.

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Diagnosis
ReferenceDiagnosis
M. D. Bryant 1945Skull near the size of that of P. malheurensis; larger than that of P. tephrus. Cranium moderately inflated, about as in Otospermophilus; rostrum relatively broader than in P. malheurensis and relatively narrower than in P. quatalensis; palate broad; notch in ventral border of zygomatic plate opposite P4. P3 larger than in P. quatalensis; other cheek 'teeth large. The diagnosis given by Matthew (1933 :4) is primarily generic rather than specific.