Key to the proposed genera

1- Careen present (Figs. 2A, B)..........................................2

1’- Careen absent (Figs. 2C–H)..........................................3

2- Ridge 1’ is left ridge (Fig. 2A). Parasites of Melomys, Rattus, Uromys from mainland Australia and Tasmania .................. Odilia Durette-Desset, 1973

2’- Ridge 1’ distinct from left ridge. Left ridge minute or replaced by a gap (Fig. 2B). Parasites of Mallomys, Maxomys, Rattus from Indonesia ................................................... Hasegawanema n. gen.

3- Ridges subequal in size (Fig. 2H). Parasites of Rattus, Uromys from Australia, Melomys from Papua New Guinea ........................ Equilophos n. gen.

3’- Ridges unequal in size....................................................4

4- Left ridges oriented perpendicularly to body surface (Fig. 3G). Parasites of Zyzomys, Mesembriomys, Melomys, Rattus, Uromys from Australia ..................................... Parasabanema Smales & Heinrich, 2010

4’- Left ridges not oriented perpendicularly to body surface..................................................................................5

5- Ventral-left-ventral ridges largest (Figs. 2D, E)............6

5’- Lateral ridges largest (Fig. 2C)....................................7

6- Right ridge larger than left ridge (Fig. 2D). Parasites of Rattus, Pseudomys, Mastacomys, Melomys from mainland Australia and Tasmania ................................................................. Chisholmia n. gen.

6’ Left ridge and right ridge of similar size (Fig. 2E). Parasites of Lorentzimys from Papua New Guinea ........................................................ Lesleyella n. gen.

7- Ridges markedly unequal in size (Fig. 2C). All ridges continuous. Parasites of Uromys from New Guinea ............................................ Hughjonestrongylus n. gen.

7’- Ridges slightly unequal in size (Fig. 2F). Dorsal ridges continuous, ventral discontinuous. Parasites of Pogonomys from New Guinea ............................................................ Sanduanensis n. gen.