Rhynchomesostoma rostratumRhynchomesostoma rostratum is a species of rhabdocoel flatworms in the family Typhloplanidae.DescriptionThe animal is 1.5 to 3.5 mm long and transparent. The anterior end is retractable.TaxonomyIt was described by Otto Friedrich Müller in 1774 as Fasciola rostrata.Distribution and habitatThe species has been recorded in Europe, India, Kenya, Siberia, and the US.Ecology and behaviorIt preys on oligochaetes, cladocerans, copepods, other microturbellarians, and mosquito larvae and other aquatic insects. It is preyed upon by the flatworm Phaenocora unipunctata.