The genus is the only species: proboscis couscous - T. spenserae Gray, 1842.
The sizes are small. Body length 7-8 cm. Tail length 9-10 cm. The end of the muzzle is elongated into a small proboscis. The tongue is long, thin, able to protrude from the mouth far (up to 2.5 cm). The eyes are small. Ears are medium long, rounded. The tail is grasping, long and thin. Hair covers only its base.
The metatarsal limb is long and narrow. All fingers, except the fused second and third, bearing claws, are distally extended and have nails. There is a kind of cesspool, where the genitourinary and anal openings open. Nipple 4.
The hairline is short and rough. The dorsal side is gray, with three brown longitudinal stripes. The middle stripe runs from the back of the head to the base of the tail, and the side from the shoulders to the hips. The sides of the body are pale reddish, the belly is yellow-white. The molars are small and weak.
It lives in thickets of shrubs and forests. The activity is nocturnal. Climbing form. It feeds on insects, pollen and nectar of flowers. Spends the day in bird nests and tree hollows.