 Our understanding of the morphology of Mesopropithecus has not always been so complete . Until recently , important pieces of the skeleton had not been discovered , including the radius , ulna , vertebrae , hand and foot bones , and the pelvis . In 1936 , Alice Carleton mistakenly associated postcranial remains of the diademed sifaka ( Propithecus diadema ) from Ampasambazimba with Mesopropithecus pithecoides and came to the false conclusion that its morphology was like that of a monkey . This mistaken attribution was corrected in 1948 by Charles Lamberton . 
