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Eucastor tortus

Mammalia - Rodentia - Castoridae

Taxonomy
Castor (Eucastor) tortus was named by Leidy (1858) [subgenus Eucastor]. Its type specimen is USNM 11020, a partial skull (partial palate and rostrum with incisors and right and left P4-M3), and it is a 3D body fossil. Its type locality is Niobrara River (coll. Hayden 1857), which is in a Barstovian/Clarendonian terrestrial horizon in the Loup Fork Formation of Nebraska. It is the type species of Eucastor.

It was recombined as Dipoides tortus by Matthew and Gidley (1904), Matthew (1909); it was recombined as Eucastor tortus by Allen (1877), Hay (1902), Matthew (1902), Stirton (1935), Voorhies (1990), Korth (2008).

Synonymy list
YearName and author
1858Castor (Eucastor) tortus Leidy p. 23
1877Eucastor tortus Allen p. 449
1902Eucastor tortus Hay p. 722
1902Eucastor tortus Matthew
1904Dipoides tortus Matthew and Gidley p. 261 figs. 11 and 12
1909Dipoides tortus Matthew
1935Eucastor tortus Stirton
1990Eucastor tortus Voorhies
2008Eucastor tortus Korth p. 177

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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
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentiaBowdich 1821
infraorderCastorimorpha
superfamilyCastoroideaGray 1821
familyCastoridae
subfamilyCastoroidinaeAllen 1877
tribeNothodipoidini
genusEucastorAllen 1877
speciestortus()

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.

†Eucastor tortus Leidy 1858
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: amphibiousf
Diet: browserf
Reproduction: viviparoussubc
Created: 2005-06-08 10:11:09
Modified: 2005-08-26 13:05:29
Source: f = family, subc = subclass, c = class, subp = subphylum
References: Nowak 1991, Hendy et al. 2009, Ji et al. 2002, Carroll 1988, Lillegraven 1979

Age range: base of the Barstovian to the top of the Clarendonian or 16.30000 to 9.40000 Ma

Collections (34 total)


Time interval Ma Country or state Original ID and collection number
Miocene23.03 - 5.333USA (South Dakota) Eucastor tortus (18113)
Barstovian16.3 - 12.5Canada (Saskatchewan) Monosaulax pansus (18759 18761 18785 18797 18798 18799)
Barstovian16.3 - 12.5USA (New Mexico) Eucastor tortus (19287 19535)
Barstovian16.3 - 12.5USA (Nebraska) Dipoides tortus (18416) Eucastor sp. (18124 18443) Eucastor tortus (18027 18090 18141 18164 18206 18208 18209 18216 18240 18275 18284 18337 18353 18442 18454)
Barstovian - Clarendonian16.3 - 9.4USA (Montana) Eucastor tortus (18805)
Barstovian - Clarendonian16.3 - 9.4USA (Nebraska) Castor tortus (190543)
Clarendonian12.5 - 9.4USA (Utah) Eucastor tortus (18913)
Clarendonian12.5 - 9.4USA (Nebraska) Eucastor tortus (18222 18299)
Clarendonian12.5 - 9.4USA (South Dakota) Eucastor tortus (18344)
Hemphillian10.3 - 4.9USA (Nebraska) Eucastor tortus (18033)