PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Microtus guildayi

Mammalia - Rodentia - Cricetidae

Taxonomy

Microtus guildayi was named by van der Meulen (1978) [Holotype: fig. 7A]. Its type specimen is CM 20333, a mandible (mandible dext. with m1-m2), and it is not a trace fossil.

It was recombined as Allophaiomys guildayi by Repenning (1983), Pfaff (1990), Repenning (1992) and Morgan and White (1995).

Sister species lacking formal opinion data

M. arvalissocialis, M. dentatus, M. fatioi, M. gregalis, M. gregaloides, M. mongolicus, M. nivalis, M. nivaloides, M. ratticeps, M. savii, M. subterraneus, M. burgondiae, M. ruffoi, M. rufoi, M. nivalis, M. subterraneus, M. hintoni, M. savii

Synonyms

Microtus involutus was named by Cope (1871). It is extant.

It was synonymized subjectively with Microtus guildayi by Kurten and Anderson (1980).
Arvicola sigmodus was named by Cope (1871).

It was synonymized subjectively with Microtus dideltus by Cope (1899); it was synonymized subjectively with Pedomys dideltus by Hibbard (1955); it was synonymized subjectively with Microtus guildayi by Kurten and Anderson (1980) and Martin (1987); it was synonymized subjectively with Allophaiomys guildayi by Repenning (1983) and Repenning (1992).
Arvicola speothen was named by Cope (1871).

It was recombined as Microtus speothen by Cope (1896), Cope (1899), Hay (1902) and Hibbard (1955); it was synonymized subjectively with Neodon by Martin (1974); it was synonymized subjectively with Microtus guildayi by Kurten and Anderson (1980) and Martin (1987); it was synonymized subjectively with Allophaiomys guildayi by Repenning (1983) and Repenning (1992).
Arvicola tetradelta was named by Cope (1871).

It was synonymized subjectively with Microtus speothen by Cope (1899) and Hibbard (1955); it was synonymized subjectively with Microtus guildayi by Kurten and Anderson (1980) and Martin (1987); it was synonymized subjectively with Allophaiomys guildayi by Repenning (1983) and Repenning (1992).

Synonymy list

Year	Name and author
1871	Arvicola sigmodus Cope
1871	Arvicola speothen Cope
1871	Arvicola tetradelta Cope
1871	Microtus involutus Cope
1896	Microtus speothen Cope
1899	Microtus speothen Cope
1902	Microtus involutus Hay p. 728
1902	Microtus speothen Hay p. 729
1955	Microtus speothen Hibbard
1978	Microtus guildayi van der Meulen
1980	Microtus guildayi Kurten and Anderson p. 261
1983	Allophaiomys guildayi Repenning
1987	Microtus guildayi Martin
1990	Allophaiomys guildayi Pfaff
1992	Allophaiomys guildayi Repenning
1995	Microtus guildayi Martin
1995	Allophaiomys guildayi Morgan and White

Is something missing? Join the Paleobiology Database and enter the data

Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia

Rank	Name	Author
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Euarchontoglires	Murphy et al. 2001
—	Gliriformes	Wyss and Meng 1996
—	Glires	()
—	Simplicidentata	()
order	Rodentia	Bowdich 1821
infraorder	Myodonta	Schaub 1958
superfamily	Muroidea	Illiger 1811
—	Eumuroida
family	Cricetidae	Fischer von Waldheim 1817
subfamily	Arvicolinae	()
tribe	Arvicolini	Giebel 1855
genus	Microtus	Schrank 1798
species	guildayi

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.

†Microtus guildayi van der Meulen 1978

show all | hide all

Invalid names: Arvicola sigmodus Cope 1871 [synonym], Arvicola speothen Cope 1871 [synonym], Arvicola tetradelta Cope 1871 [synonym], Microtus involutus Cope 1871 [synonym]

Diagnosis

Reference	Diagnosis
A. J. van der Meulen 1978	Medium sized Microtus species, with lengtehned and somewhat complicated anteroconid complex; the mea of A/L equals or is greater than 44.5, but is less than 46.3; the mean of B/W equals or is greater than 23.0, but is less than 28.0, the mean of C/W equals or is greater than 20.0; the mean of W'/W equals or is greater than 76.0 but is less than 85.0. Microtus guildayi differs from Microtus sp. from Wathena and Kentuck in having higher mean A/L and W'/W values and lower mean B/W and C/W values; Microtus guildayi differs from Microtus llanensis Hibbard in having lower mean A/L and W'/W values and higher mean B/W value; it differs from Microtus nutiensis Chaline and Microtus burgondiae Chaline in having higher mean B/W value.