The white-bellied woolly mouse opossum (Marmosa constantiae) is a small pouchless marsupial of the family Didelphidae. It was formerly assigned to the genus Micoureus, which was made a subgenus of Marmosa in 2009. The specific epithet was given in honour of Constance Sladen (née Anderson), wife of the naturalist Percy Sladen. She funded the 1902 expedition which collected the type specimen.
The feet are broad, with stout claws and ridges on the underside of the toes that aid in climbing trees. Females do not have a pouch, but have fifteen teats arranged in a circle - more than in any of this species' closest relatives. and has been found from near sea level to montane forests as high as elevation.
Biology and behaviour
The opossum is arboreal, solitary, and nocturnal, spending most of its time in the forest understory. It is omnivorous, feeding on insects (especially bugs) and vegetable matter. Little is known of their reproductive biology, but they appear to breed throughout the year, and mothers have been captured with up to seven young attached to their teats.