Nepenthes pilosa is easily distinguished from most other species in the genus on the basis of its hook-shaped lid appendage.Clarke, C.M. 2001. A Guide to the Pitcher Plants of Sabah. Natural History Publications (Borneo), Kota Kinabalu. The only other Bornean Nepenthes species with a similarly developed appendage are N. burbidgeae and N. chaniana.
