Lithoglyphus naticoides was observed for the first time in the north of France at the beginning of the 19th century, but sincethen this gastropod has only succeeded in colonising the eastern half of this country. A map showing its distribution in Franceis proposed. In the Saône river, L. naticoides is an annual species: spawning occurs from March to June and the juveniles thatgenerally appear in May grow rapidly during the summer then spawn and disappear in the spring of the following year. Differentobservations suggest that increased water temperatures occurring in the context of global warming and potential/possible interspecificcompetition are the main reasons for the disappearance of L. naticoides in the Saône river at Lyon since November 2004.