Morphological and morphometric characters of two species of superfamily Sphaerularioidea, recovered in southwestern Iran namely Deladenus durus and Prothallonema obtusum are given. The recovered specimens of D. durus are characterized by having a valvular chamber in metacorpus and excretory pore posterior to the hemizonid. The Iranian population of P. obtusum is characterized by having four lines in the lateral field, excretory pore anterior to the end of pharynx, not bulgy vulva region and short subcylindrical tail.