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