It was originally considered to be a subspecies of the eastern lesser bamboo lemur ( '' Hapalemur griseus '' ) , and is of similar size , but is darker and redder than the eastern lesser bamboo lemur , with a shorter tail and different vocalizations .
It was originally proposed as a subspecies of the eastern lesser bamboo lemur and is of similar size . 
 However , it is darker and redder than the eastern lesser bamboo lemur , with a shorter tail and different vocalizations .