The purpose of this application is to conserve the specific name of one fresh water ciliate (Stromhidium gyrans Stokes, 1887) that has frequently been used as an indicator for the ecological monitoring of water quality and of another (Sirobilidium caudatum Kahl, 1932) that was given to a rare but characteristic brackish water species. Both names are threatened by Strombidion caudatum Fromentel, 1876, which is probably a senior synonym of the first and is a senior secondary homonym of the

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... Strombidion caudatum Fromentel had not been used for almost a century until its reintrod action by Foissner (1987): its suppression is proposed.