Skrjabinodon alcaraziensis sp. n. (Nematoda: Pharyngodonidae) is described from the cloaca of Algyroides marchi Vaiverde, 1958 (Sauria: Lacertidae) from the Alcaraz Mountains (SE Iberian Peninsula). This nematode is characterized by the presence of an unpaired postcloacal papilla in the males, the presence of cuticular spines in the tail of the female and the absence of polar plugs in the eggs.