Amphithalassius is a genus of flies in the family Dolichopodidae. It is found along sandy sea coasts in South Africa. It contains two described species, and three undescribed species known only from females. It is closely related to Plesiothalassius.
Species Amphithalassius latus Ulrich, 1991 Amphithalassius piricornis Ulrich, 1991
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