1 Spicules jointed···························································· Rhips
– Spicules not jointed···························································· 2
2 Amphideal fovea with thickened walls looking like a double contour···································································· 3 – Amphideal fovea without thickened walls······················ 4
3 Gubernaculum without lateral pieces · Adeuchromadora
– Gubernaculum with lateral pieces ················ Actinonema
4 Pharynx with posterior terminal bulb····························· 5
– Pharynx without posterior terminal bulb······················· 7
5 Gubernaculum without lateral pieces ············ Trochamus
– Gubernaculum with lateral pieces ··································· 6
6 Precloacal cuticular elevation present ····· Portmacquaria
– Precloacal cuticular elevation absent············ Steineridora
7 Gubernaculum without lateral pieces ········· Endeolophos
– Gubernaculum with lateral pieces ··································· 8
8 Buccal cavity with rows of denticles ········· Euchromadora
– Buccal cavity without denticles ········································ 9
9 Precloacal cuticular elevation present ··· Parapinnanema
– Precloacal cuticular elevation absent····························· 10
10 Amphideal fovea oval ······································ Crestanema
– Amphideal fovea either transverse slit-like or indistinct ··········································································· Graphonema