Key to the species of Heterocuma

1. Endopod of uropod distinctly shorter than peduncle ................................................. 2

– Endopod of uropod at least as long as peduncle ........................................................ 3

2. Pereopod 2 and 3 with biarticulate exopods.... H. africanum intermedium (Fage, 1924)

– Pereopod 2 and 3 with uniarticulate exopods .... H. africanum africanum Zimmer, 1921

3. Uropod endopod article 1 shorter than article 2........................................................... 4

– Uropod endopod article 1 longer than article 2 .............................. H. sarsi Miers, 1879

4. Pleonites without carinae ........................................................ H. armatum Kurian 1954

– Pleonites with carinae................................................................................................... 5

5. Pereonites 2 and 3 with a paired dorsal carina, anterolateral margin of carapace smooth ........................................................................................................... H. inerme sp. nov.

– Pereonites 2 and 3 with a median dorsal carina and prominent dorsolateral and lateral carinae, anterolateral margin of carapace serrated H. andamani Kurian, 1954