1. Lateral margin of uropodal endopod unarmed........................................ S. parvispinus
— Lateral margin of uropodal endopod serrated............................................................. 2
2. Carapace without postrostral submedian and anterolateral spines............................... 3
— Carapace with postrostral submedian and anterolateral spines.................................... 4
3. Carapace with small tubercle on hepatic region; dorsal margin of palm of third pereopod sharply carinate, with row of setae...................................................... S. depressus n. sp.
— Carapace unarmed on hepatic region; dorsal margin of palm of third pereopod not carinate, but serrate................................................................................................... S. levigatus
4. Carapace with scattered spinules on branchial region; merus of third pereopod unarmed or armed with row of small teeth or denticles on lateral margin................. S. goyi n. sp.
— Carapace unarmed on branchial region; merus of third pereopod armed with 1 large tooth on lateral margin........................................................................................................ 5
5. First pereopod with well developed grooming apparatus; second pereopod naked, with carpus being subequal in length to merus............................................. S. andamanicus
— First pereopod with rudimentary grooming apparatus; second pereopod with numerous setae, with carpus being longer than merus................................................................. 6
6. Cornea of eye darkly pigmented; second pereopod 1.2-2.1 times longer than carapace in females, 1.5-2.2 times in males.................................................................... S. venustus
— Cornea of eye opaque; second pereopod 2.1-2.2 times longer than carapace in females, 2.4-2.6 times in males........................................................................ S. robustus n. sp.