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Citellus ridgwayi

Mammalia - Rodentia - Sciuridae

Taxonomy
Citellus ridgwayi was named by Gazin (1932). Its type specimen is CIT 334, a partial skull (The facial region of the skull, including most of the right zygomatic arch and all of the teeth except the right P3; the incisors are broken at the alveoli), and it is a 3D body fossil. Its type locality is Skull Spring, which is in a Barstovian terrestrial volcaniclastic in the Butte Creek Formation of Oregon.

It was synonymized subjectively with Citellus tephrus by Black (1963); it was synonymized subjectively with Otospermophilus tephrus by Barnosky (1986); it was synonymized subjectively with Spermophilus tephrus by Shotwell (1968), Wilson and Reeder (1993), Korth (1994).

Sister species lacking formal opinion data
C. major, C. parryi, C. primigenius, C. superciliosus, C. tridecemlineatus, C. xanthoprymnus

Synonymy list
YearName and author
1932Citellus ridgwayi Gazin
1945Citellus ridgwayi Bryant p. 354 figs. Pl. 7, fig. d

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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()
RankNameAuthor
—Mammaliamorpha
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentiaBowdich 1821
superfamilySciuroidea
familySciuridae
tribeMarmotini
genusCitellusCuvier 1825
speciesridgwayi

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.

†Citellus ridgwayi Gazin 1932
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Diagnosis
ReferenceDiagnosis
M. D. Bryant 1945Size of skull and length of maxillary tooth row near that of C. lateralis chrysodeirus. Skull shallower, cranium less inflated, interorbital region wider, and zygomatic arches more closely appressed to skull than in Recent species. P3 minute; P4 short anteroposteriorly because of small size of anterior and posterior cingula.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: semifossorialg
Diet: granivoref
Diet 2: frugivoref
Reproduction: viviparoussubc
Created: 2012-05-15 10:05:16
Modified: 2012-05-14 21:55:07
Source: g = genus, f = family, subc = subclass, c = class, subp = subphylum
References: Fernández et al. 2000, Lillegraven 1979, Nowak 1991, Hendy et al. 2009, Ji et al. 2002, Carroll 1988

Age range: Barstovian or 16.30000 to 12.50000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Barstovian16.3 - 12.5USA (Oregon) Citellus ridgwayi (type locality: 19056)