We report morphometric data for 133 specimens of Diplometopon zarudnyi (Squamata: Trogonophidae) collected across its range within Riyadh province of Saudi Arabia. One-way analyses of variance revealed that differences exist in most characters. Snout-vent length and vent-tail length showed slight and inconsistent differences among samples. D. zarudnyi is characterized by 164-175 body annuli; 165-178 dorsal annuli; 13-17 caudal annuli with absence of caudal autotomy. In addition, 2-4 lateral annuli; 45-54 mid-body segments; 39-50 posterior segments; 4-5 head's plates and 4-6 pre-cloacal pores were recorded in both males and females without gender difference. The present study revealed the widespread distribution of this species in the studied region, since land topography in this area is characterized by the absence of any natural barriers which could restrict the spread of this amphisbaenian lizard D. zarudnyi.
Keywords: Amphisbaenia; Diplometopon zarudnyi; Dorsal annuli; Saudi Arabia; Worm lizard.