Abstract: Samples of Ostracoda were collected from the Taiwan Strait in August 1984.Through the analysis of all the samples, a new species of Euphilomedes(Ostracoda:Philomedidae)is found, Euphilomedes multiangular sp.nov.The type specimen is deposited in the Third Institute of Oceanography, SOA.The specific diagnoses of new species are as follows:Euphilomedes multiangular sp.nov.(♂)The new species is distinguished by the truncate posterior with three clusters of spines along the edge;the frontal organ has five joints with three spines on the tip of the teminal segment;The third segment of the endopodite of the second antenna is elongate with uneven margins, and the long bristles near middle with marginal spines, the tip of this segment is provided with five ranged ridges.