Water-fern-weevil
Guides
Stenopelmus
marsh weevils
Stenopelmus is a genus of marsh weevils comprising at least two described species. The genus is best known for Stenopelmus rufinasus, a North American weevil introduced to Europe in the late 19th century alongside its host plant Azolla filiculoides. Members of this genus are specialized herbivores associated with aquatic ferns and have been employed as biological control agents for invasive water fern management.