Family PHILOMETRIDAE Baylis & Daubney, 1926

Family diagnosis (after Moravec 2013). Female body long. Head end rounded, peribuccal ring absent. Mouth simple, buccal capsule absent. Mouth opening usually surrounded by four to eight cephalic papillae. Males much smaller than females. Two equal or slightly unequal spicules; gubernaculum present or absent. Vulva and vagina more or less completely atrophied in gravid worms. Uterus amphidelphic. Viviparous. Parasitic in subcutaneous tissues, body cavity, serosa or blood vessels of fishes.