Rhynchomesostoma rostratum is a species of rhabdocoel flatworms in the family Typhloplanidae.

[1] The animal is 1.5 to 3.5 mm long[2] and transparent.

[3] It was described by Otto Friedrich Müller in 1774 as Fasciola rostrata.

[1][4] The species has been recorded in Europe, India, Kenya, Siberia, and the US.

[1] It preys on oligochaetes, cladocerans, copepods, other microturbellarians, and mosquito larvae and other aquatic insects.