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Hiskatherium
Taxonomy
Hiskatherium was named by Pujos et al. (2011). Its type is Hiskatherium saintandrei.
It was assigned to Megatherioidea by Pujos et al. (2011).
It was assigned to Megatherioidea by Pujos et al. (2011).
Species
H. saintandrei (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Hiskatherium Pujos et al. p. 1134 |
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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
| Reference | Diagnosis | |
|---|---|---|
| F. Pujos et al. 2011 | Diagnosis—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). |