Urumacotheriinae

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 : 1524

Urumacotheriinae

PP = 60, age = 17.82 Mya (14.03–21.51).

This clade was originally proposed with fewer taxa ( Negri & Ferigolo, 2004), but was expanded here to include both Urumacotherium and Pseudoprepotherium . It did not receive high node support, despite being present in trees from all analyses.

Urumacotheriinae was supported by seven synapomorphies (five for both methods and two exclusively for BI): molariform morphology of Cf1/ cf1 (BI); posterior edge of mandibular condyle inclined posterodorsally; eversion of lateral edge of symphyseal spout (BI); premolariform portion of palate roughly equal or longer than the length of molariform toothrow; presence of a distinct neck at the base of occipital condyles; occipital condyles elongated anteroposteriorly in ventral view; and lesser tubercle of humerus proximally projected as much as greater tubercle.