Neohydronomus
Hustache, 1926
waterlettuce weevils
Species Guides
1- Neohydronomus affinis(Waterlettuce Weevil)
Neohydronomus is a of subaquatic weevils comprising three native to South and Central America. All species are obligate on waterlettuce (Pistia stratiotes), an floating aquatic plant. The genus has been utilized as a agent, with N. affinis successfully introduced to Florida in 1987 to manage waterlettuce .
Pronunciation
How to pronounce Neohydronomus: /ˌniːoʊhaɪdroʊˈnoʊməs/
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Identification
Distinguished from other weevil by subaquatic lifestyle combined with exclusive association with Pistia stratiotes. White-scaled without water- adaptations is notable among aquatic insects. The three within the genus require examination for differentiation.
Appearance
covered in white with no water- features. Subaquatic habitus.
Habitat
Subaquatic environments in slow-moving streams, waterways, lakes, and rivers where waterlettuce forms dense floating mats composed of interconnected rosettes.
Distribution
Native range: South and Central America. Introduced : N. affinis established in peninsular Florida since 1987 (first released at Torry Island and Kreamer Island, Lake Okeechobee) and reported in Louisiana. GBIF records from Chocó Department, Colombia.
Diet
All three feed exclusively on waterlettuce (Pistia stratiotes).
Host Associations
- Pistia stratiotes - obligate plantExclusive food source for all three in the
Behavior
Subaquatic lifestyle. No water- features on despite aquatic .
Ecological Role
Specialized herbivore and agent of waterlettuce. Reduces dense floating mats that diminish biological diversity and create obstructions for boating, waterflow, and aquatic organisms.
Human Relevance
N. affinis introduced to Florida in 1987 as a agent for class II prohibited aquatic plant waterlettuce. Successfully established and contributes to management of this plant in waterways.
Similar Taxa
- Other aquatic weevil generaNeohydronomus is distinguished by its obligate, exclusive association with Pistia stratiotes and lack of water- exoskeletal features despite subaquatic habit.
More Details
Taxonomic note
placement varies between sources: Brachyceridae (Catalogue of Life, GBIF) versus Curculionidae (iNaturalist, original EDIS publication). This reflects ongoing classification debate within Curculionoidea.