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

Ganastrapotherium

Mammalia - Ungulata - Astrapotheriidae

Synonymy list
YearName and author
1984Ganastrapotherium Johnson p. 51 figs. 14-15-17-18-20-21-22

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

RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
RankNameAuthor
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
orderUngulata(Linnaeus 1766)
Meridiungulata
orderAstrapotheria
familyAstrapotheriidaeAmeghino 1887
genusGanastrapotherium

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
S. Johnson 1984Granastrapotherium snorki differs from all other known astrapotheres in lacking all upper and lower incisors, having canines enlarged into huge, evergrowing tusks with the lowers procumbent and not so recurved as in Parastrapotherium, Astrapotherium, Xenastrapotherium, and typically possessing an external diagonal wear facet from contact with the upper canine. Granastrapotherium lacks the third upper premolar and has P4 reduced possessing only a single internal and external cusp. All molars are expanded buccalingually and lack any cingula. Granastrapotherium is readily distinguished from Astrapotherium an Xenastrapotherium by its lack of lower incisors P3, and by its unique tusk conformation, from Astrapothericulus (a dwarf form) by its large size, lack of lower incisors, P3, and by its possessions of evergrowning tusks, and from Uruguaytherium, which is based upon a single mandibular fragment, by its possessions of a hypoflexid groove on M1-3 and more distally-oriented, more rounded metalophid on M2-3.