Obligate-herbivore
Guides
Neohydronomus affinis
Waterlettuce Weevil
Neohydronomus affinis is a subaquatic weevil native to South and Central America that has been deployed as a biological control agent against the invasive aquatic plant waterlettuce (Pistia stratiotes). First introduced to Florida in 1987, it has successfully established populations in peninsular Florida and Louisiana. The weevil's exoskeleton is covered in white scales and lacks water-resistant features, an unusual trait for an insect living in aquatic environments.