First record of Orconectes juvenilis (Hagen, 1870) in eastern France: update to the species identity of a recently introduced orconectid crayfish (Crustacea: Astacida).
In 2005 a new, non-indigenous crayfish species was discovered in the Dessoubre River (eastern France). The species was initially considered as Orconectes rusticus (Girard, 1852). However, an examination of form I males caught in 2007 revealed that the species is in fact Orconectes juvenilis (Hagen, 1870), a closely related congener of O. rusticus. According to our knowledge, this is the first record of O. juvenilis outside the North American continent. The ecological implications as well as the possible impact on the native European crayfish are discussed briefly.