Plesiothalassius is a genus of flies in the family Dolichopodidae. It is found along sandy sea coasts in South Africa. It contains three described species. It is closely related to Amphithalassius.
Species Plesiothalassius capensis (Smith, 1972) Plesiothalassius flavus Ulrich, 1991 Plesiothalassius natalensis Ulrich, 1991
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