 Mesopropithecus is an extinct genus of small to medium @-@ sized lemur , or strepsirrhine primate , from Madagascar that includes three species , M. dolichobrachion , M. globiceps , and M. pithecoides . Together with Palaeopropithecus , Archaeoindris , and Babakotia , it is part of the sloth lemur family ( Palaeopropithecidae ) . Once thought to be an indriid because its skull is similar to that of living sifakas , a recently discovered postcranial skeleton shows Mesopropithecus had longer forelimbs than hindlimbs — a distinctive trait shared by sloth lemurs but not by indriids . However , as it had the shortest forelimbs of all sloth lemurs , it is thought that Mesopropithecus was more quadrupedal and did not use suspension as much as the other sloth lemurs . 
