Key to world species of Adeliella

1a. Gnathopod 1 palm finely serrate; telson subtriangular .... Ad. olivieri De Broyer, 1975

1b. Gnathopod 1 palm grossly dentate; telson rounded ........................................................ 2

2a. Telson 15–20% cleft; gnathopod 2 carpus with a well-developed posterodistal lobe .............................................. .............................................. Ad. laticornis Nicholls, 1938

2b. Telson more than 40% cleft; gnathopod 2 carpus without a well-developed posterodistal lobe ......................................................................................................................................... 3

3a. Gnathopod 1 carpus short, about 0.4× propodus length; propodus palmar corner defined by one robust seta and a subacute process; urosomite 1 with a well-developed dorsal carina...................................... ...................................... Ad. debroyeri sp. n.

3b. Gnathopod 1 carpus long, subequal to propodus length; propodus palmar corner defined by two robust setae and without a subacute process; urosomite 1 with a poorly developed dorsal carina .............................. Ad. takoradia (J.L. Barnard, 1961)