DRACUNCULOIDEA

Arai, Hisao P. & Smith, John W., 2016, Guide to the Parasites of Fishes of Canada Part V: Nematoda, Zootaxa 4185 (1), pp. 1-274 : 37

Key to Families of DRACUNCULOIDEA

1 Vulva anterior or pre-equatorial, well developed in mature female; monodelphic or didelphic......................... 2

- Vulva posterior or equatorial, more or less completely atrophied in mature female; two ovaries present...... Philometridae

2 Spicules present; caudal alae in male absent or reduced............................................. Guyanemidae

- Spicules absent; caudal alae in male absent................................................... Daniconematidae