<unk>  are a subclass of the roundworms.  Most are free-living, but the group includes the order Trichurida, which includes whipworms and trichina worms.  The anterior sensory structures (amphids) are well developed, while the posterior ones (phasmids) are not.
Enoplia
Papulosquamous lesions
Genital wart
Supernumerary nipple
Blue nevus
Papilloma
Acalculia
Acral nevus