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Sigmodon curtisi

Mammalia - Rodentia - Cricetidae

Taxonomy
Sigmodon curtisi was named by Gidley (1922). Its type specimen is USNM 10510, a mandible, and it is a 3D body fossil.

Synonymy list
YearName and author
1922Sigmodon curtisi Gidley
1980Sigmodon curtisi Kurten and Anderson p. 251

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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()
Therapsida()
infraorderCynodontia()
RankNameAuthor
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
EuarchontogliresMurphy et al. 2001
Glires()
orderRodentia
infraorderMyodontaSchaub 1958
superfamilyMuroideaIlliger 1811
familyCricetidaeFischer von Waldheim 1817
subfamilySigmodontinaeWagner 1843
tribeSigmodontiniWagner 1843
genusSigmodonSay and Ord 1825
speciescurtisi

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
J. W. Gidley 1922Length of cheek-tooth series 7 millimeters; about the size of S. hispidus arizonae, which it seems to resemble more nearly, but it differs from that as well as the other living species in the more open valleys of the reentrant angles, the more compressed lophs, the less hypsodont condition of the cheek teeth, the relatively deeper posterior inner reentrant valley of p4 and m1, and especially the form and proportions of the cusps of the last lower molar, which is relatively larger, with the hinder cusp relatively broader and fuller than in the living species. A feature that is characteristic of this and the species described below [Sigmodon minor] and is not observed in any of the living species is noted in the last molar, in which the great extension and flattening of the inner or lingual wall of the posterior lobe forms a sharp right angle with the posterior wall of the reentrant angle on that side.