Family Onchocercidae Leiper

1. Buccal cavity long, tubular, with thick walls; vulva postoesophageal or at level of oesophagus....... Litomosoides Chandler Species: L. artibei Esslinger, 1973; L. brasiliensis Almeida, 1936; L. caliensis Esslinger, 1973; L. carolliae venezuelensis Rodrigo, 1964; L. chandleri Esslinger, 1973; L. colombiensis Esslinger, 1973; L. hamletti Sandground, 1934; L. molossi Esslinger, 1973; L. salazari Notarnicola, Jiménez Ruíz & Gardner, 2010; L. serpicula (Molin, 1858); L. solarii Guerrero, Martin, Gardner & Bain, 2002; L. teshi Esslinger, 1973; L. yutajensis Guerrero, Martin & Bain, 2003; Litomosoides sp.

- Buccal cavity not long and tubular, without thick walls; vulva pre-oesophageal......... .. Migonella Lent, Freitas & Proença Species: M. fracchiai Lent, Freitas & Proença, 1946