 They do not have a fenestra on the maxilla, but the fenestra cochlea is exposed The "Marmosops creightoni" is a species that is medium in size with a coat that is almost completely dark with no clear distinction between the dorsal and ventral sides.This is the only species of the genus without the white markings on the underside.The chin fur is white and continues down to the throat along with a black mask around the eyes.