Key to the species of Alcyonohippolyte gen. nov.

1. Carapace dorsally gibbous. Fingers of pereiopod I about half as long as palm. Associated with soft coral family Nephtheidae ...................................................................................... A. dossena sp. nov.

- Carapace normal, not gibbous. Fingers of pereiopod I subequal to palm........................................... 2

2. Carapace covered with tufts of plumose setae dorsally. Dactylus of pereiopod III with swollen basal part and small accessory tooth. Propodus of pereiopod III with a pair of distinct distoventral spines in females. Associated with soft coral family Alcyoniidae .......................................................................... A. maculata sp. nov.

- Carapace naked, without dorsal setae. Dactylus of pereiopod III relatively slender, usually without accessory tooth. Propodus of pereiopod III lacking or at most with a pair of minute spinules at distoventral angle. Associated with soft coral family Xeniidae ...................................................................... A. commensalis comb. nov.