1 Carapace and/or rest of body with spiny or serrate integument................................................ 2
—— Carapace and/or rest of body without spiny or serrate integument........................................... 8
2 Whole body with spiny integument.......................................................................................... 3
—— Carapace and body with a few dorsal spines............................................................................. 5
3 Carapace with 5 mediodorsal long spines........................................................ Styloptocuma sp.
—— Carapace without mediodorsal spines................................................................ S. anae sp. nov.
5 Carapace with more than 2 dorsal spines.................................................................................. 6
—— Carapace with 2 dorsal spines............................................................................ S. halei sp. nov.
6 Carapace with more than 7 dorsal spines........................................ S. spinosum Petrescu, 2006
—— Carapace with 7 dorsal spines................................................................................................... 7
7 Pereopod 1 carpus longer than propodus............................................. S. poorei Petrescu, 2006
—— Pereopod 1 carpus shorter than propodus...................................................... S. angelae sp. nov.
8 Uropodal endopod with 6 medial setae....................................... S. granulosum Petrescu, 2006
—— Uropodal endopod with less than 6 medial setae...................................................................... 9
9 Pereopod 2 dactylus more than twice propodus length........................................................... 10
—— Pereopod 2 dactylus 1.66.............................................................................. S. aurorae sp. nov.
10 Pereopod 2 dactylus 2.6 propodus length......................................... S. nodosum Petrescu, 2006
—— Pereopod 2 dactylus 2 propodus length....................................... S. australiense Petrescu, 2006