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Arctomyoides arctomyoides

Mammalia - Rodentia - Sciuridae

Taxonomy
Sciurus arctomyoides was named by Douglass (1903). Its type specimen is CM 741, a partial skull (Upper incisors in fragments of the premaxillae; the right P3, P4, and Ml in a fragment of the maxilla; a nearly complete left mandibular ramus with all of the t), and it is a 3D body fossil.

It was recombined as Arctomyoides arctomyoides by Bryant (1945), Black (1963) and Tabrum and Nichols (2001).

Synonymy list
YearName and author
1903Sciurus arctomyoides Douglass
1945Arctomyoides arctomyoides Bryant p. 361 figs. P1. 8, fig. f
1963Arctomyoides arctomyoides Black
2001Arctomyoides arctomyoides Tabrum and Nichols

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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()
RankNameAuthor
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
EuarchontogliresMurphy et al. 2001
Glires()
orderRodentia
superfamilySciuroidea
familySciuridae
genusArctomyoides
speciesarctomyoides()

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
M. D. Bryant 1945Mandibular ramus slightly larger than that of Cynomys l. ludovicianus, larger than that of any North American species of Sciurus and smaller than the rami of Marmota and Palaearclomps. Messeteric fossa broadly rounded anteriorly; terminates below posterior margin of p4.