Ascarophis van Beneden, 1871

Synonym: Pseudocystidicola Layman, 1933

Generic diagnosis (after Moravec 2013). Cystidicolidae . Small to medium sized worms. Pseudolabia continuous medially with anterior extensions of lateral walls of buccal cavity; anterior surface of each pseudolabium with prominent conical protuberance or blunt knob. Flap-like or bilobed sublabium along inner margin of each submedian labium. Four cephalic papillae. Mouth opening dorso-ventrally elongated, with four lateral recesses. Deirids simple, small. Male with pre-cloacal cuticular ridges (an area rugosa). Male caudal alae well developed supported by pedunculate papillae. Spicules unequal and dissimilar. Female tail ends bluntly or with knob-like structure. Uterus amphidelphic. Vulva equatorial or postequatorial. Eggs elliptical, embryonated, with or without polar filaments. Parasitic in alimentary tract of fishes.