The new species Minibiotus pentannulatus sp. nov., is described from the Sierra Nevada de Santa Marta, Colombia. It differs from the other species of the genus by star-shaped pores, the presence of a peculiar egg with a smooth shell, and small conical processes with 5 annulations. Other differences include the distribution and size of the pores, and other morphometric details regarding the size of the body and buccal tube, and the pt of the stylet support insertion point, macroplacoids and claws. To date, the genus Minibiotus R.O. Schuster, 1980, comprises 48 species, including the species described here.