[6] The sloth lemurs were mixed-feeders rather than specialized browsers who ate a mixed diet based on seasonality.

[7] Postcranial measurements and anatomy suggest that three of the four genera, Palaeopropithecus, Babakotia, and Mesopropithecus were primarily arboreal and suspensory.

Recently, DNA from extinct giant lemurs has confirmed this, as well as the fact that Malagasy primates in general share a common ancestor.

[9] The post-canine teeth of sloth lemurs are similar in number (two premolars, three molars) and general design to living indriids.

Babakotia and Mesopropithecus preserve the typical indriid-like toothcomb, but Palaeopropithecus and Archaeoindris have replaced it with four short and stout teeth of unknown functional significance.