| Abstract | | Flagitopisa philippensis is redescribed on the basis of recent collections from various localities in the Philippine Islands. Paratypes of Psammogammarus fluviatilis from a single locality in the Philippines were also examined, and this species, which is closely similar to F. philippensis, is reassigned to Flagitopisa. Both of these species possess a pair of weakly stalked, subovate "coxal-like" gills attached to the ventral surface of the first pleonal segment, just anterior to pleopod 1. Aside from these two species, pleonite gills with this morphology are unknown in hadzioid amphipods.
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