Key to the species of Platypilumnus

1. Frontal margins with a row of strong spines or spinules.....................................................2

2. Front with 5 strong spines each side of median groove................................... P. gracilipes

3. Posterolateral border of carapace carries spinules and granules; infra-orbitalbordergranular P.inermis

-- Posterolateral border of carapace smooth; infra-orbital border denticulated .......................................................................................................P.jamiesonin.sp.