Nothrotheriinae

Casali, Daniel M, Boscaini, Alberto, Gaudin, Timothy J & Perini, Fernando A, 2022, Reassessing the phylogeny and divergence times of sloths (Mammalia: Pilosa: Folivora), exploring alternative morphological partitioning and dating models, Zoological Journal of the Linnean Society 196 (4), pp. 1505-1551 : 1529

Nothrotheriinae plus Megatheriinae

PP = 54, age = 17.96 Mya (16.39–19.87).

This clade, which unites the clades Nothrotheriinae and Megatheriinae , was recovered only for H models and par_IW10 and par IW5, as stated above, and was poorly supported.

The clade was supported by four synapomorphies, recovered with both methods: presence of lingual and labial grooves in mf3; temporal lines approximate midline but do not meet to form a sagittal crest on skull roof; well-developed buccinator fossa of maxilla, with a deep depression; and Glaserian fissure opening into a distinct groove in squamosal lying medial to entoglenoid process.