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

Hiskatherium

Mammalia -

Synonymy list
YearName and author
2011Hiskatherium Pujos et al. p. 1134 figs. Figs. 3-4

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()
Placentalia
Americatheria
Xenarthra()
infraorderPilosaFlower 1883
superfamilyMegatherioideaGray 1821
genusHiskatherium

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
F. Pujos et al. 2011Diagnosis—Small-sized fossil sloth (smallest megatherioid,
comparable to Schismotherium fractum; Table 1); presence of
four lower molariform teeth without diastema (m1–m4; as in Diabolotherium
and in contrast with Nothrotheriidae); teeth strongly
hypsodont (HI = 0.93; comparable to that of Huilabradys,
0.94, and much greater than that of Diabolotherium, Xyophorus,
and Hapalops; Table 2); m1–m4 bearing two transverse
(mesial and distal) lophids separated by a deep transverse valley
that opens labially; lophids perpendicular to the mesiodistal
axis of the tooth row, except the distal lophid of m4, which
is oriented mesiolingually-distolabially; m1–m3 subrectangular
in shape with rounded corners (more square in Diabolotherium
and Megatheriinae) and mesiodistally compressed (less compressed
in D. nordenskioldi and X. villarroeli); m1 without vertical
groove and m2–m3 with shallow lingual vertical grooves
(lingual and labial vertical grooves occur on m1–m3 in Diabolotherium,
some Nothrotheriidae, and Megatheriinae); m4 circular
in cross-section and lacks vertical groove (labial vertical
groove occurs in Diabolotherium; in nothrotheriids the last lower
molariform tooth has lingual and labial vertical grooves); distolingual
wear facet of m4 (posterior to the distal lophid) large compared
to other nothrotheriid sloths; on m4 the cuspid A is lingual
and not distolingual as in m1–m3 and connects mesial and distal
lophids; in occlusal view the posteroventral margin of symphysis
located anterior to m1 (located at the level of the mesial margin
of m1 in Diabolotherium).