Key to the nominal species of Crosniera Kensley and Heard, 1991

1. Distolateral margin of uropodal endopod with spine................................................................................... 2

- Distolateral margin of uropodal endopod smooth (lacking spine) .............................................................. 3

2. Lateral margins of telson with one or two blunt or weakly developed spines. Pereopod 1 ischium without distinct row of spines ............................................................................. Crosniera minima (Rathbun, 1901)

- Lateral margin of telson with a pair of distinct, acutely tipped spines. Pereopod 1 ischium with distinct row of spines .................................................................................................... Crosniera panie Poore, 1997

3. Third maxilliped inner margin of merus rounded, lacking spine. Maxillipeds 2 and 3 with long exopods (extending beyond articulation of merus and carpus)..................................... Crosniera wennerae sp. nov.

- Third maxilliped inner margin of merus armed with a spine. Maxillipeds 2 and 3 with short exopods (not extending beyond articulation of merus and carpus).................................................................................. 4

4. Eyes rounded distally. Third maxilliped with strong spine on distal inner margin and another smaller spine at mid-length of inner margin of merus. Uropodal endopod twice as long as wide, with small spine on median carina ........................................................................................... Crosniera dayrati Ngoc-Ho, 2005

- Eyes acute distally. Third maxilliped with only a single small spine on distal inner margin of merus. Uropodal endopod less than twice as long as wide, lacking spine on median carina.................................... ................................................................................................................... Crosniera corindon Poore, 1997