Megatheriidae

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 : 1528

Megatheriidae minus Analcimorphus

PP = 100, age = 18.47 Mya (16.97–20.24).

This clade is composed of the clades Prepotheriinae , Nothrotheriinae and Megatheriinae , which were recovered in two alternative arrangements: ( Prepotheriinae , ( Nothrotheriinae , Megatheriinae )) for H models, par_IW10 and par IW5, and ( Megatheriinae , ( Nothrotheriinae , Prepotheriinae)) for par_EW and par_IW_100. For A models that contain the clade, both arrangements were observed.

The clade was supported by 17 synapomorphies (ten for both methods and seven exclusively for BI): Cf1 closer to Mf1 than to anterior edge of maxilla (BI); deep zygomatic process almost covers the entire squamosal exposure; occiput vertical or slightly inclined posterodorsally; sessile occipital condyles (BI); median fusion of posterior alae of vomer; medial expansion of entotympanic dorsal to basicranium; occipital artery passes through a closed canal in mastoid; absence of intertrochanteric ridge; moderately developed lesser trochanter of femur, with a laminar projection (BI); distal epiphyses of femur twisted with respect to the main axis (BI); lateral facet of anterior border of tibial proximal epiphysis located posterior to medial facet (BI); distal fibular articulation for tibia posterolaterally positioned; odontoid process well defined only on distal half of proximodistal length of tibial surface (BI); slightly obtuse (around 120°) angle formed by discoid and odontoid facets of astragalus, in distal view; process for navicular on astragalus at the level of the odontoid facet; transverse diameter of discoid facet of astragalus smaller than that of odontoid facet (BI); and obtuse (around 120°) angle formed by facets for cuboid and metatarsal IV, in metatarsal V.