Megamelus scutellaris
Berg, 1883
water hyacinth planthopper, waterhyacinth planthopper
Megamelus scutellaris is a small delphacid planthopper native to South America, where it is monophagous on water hyacinth (Pontederia crassipes). The has been introduced to multiple regions including Florida (2010) and South Africa (2013) as a agent for water hyacinth. It exhibits wing dimorphism, with occurring as either wingless (brachypterous) or winged () forms. genetic studies indicate three main lineages in its native range associated with major river basins, shaped by Pleistocene climatic shifts and Holocene hydrological changes.
Pronunciation
How to pronounce Megamelus scutellaris: //ˈmɛɡəˌmiːləs ˌskjuːtəˈlɛərɪs//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
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Habitat
Freshwater aquatic systems supporting water hyacinth, including lakes, rivers, canals, and wetlands. Found specifically on floating mats of water hyacinth where it completes its entire .
Distribution
Native to South America: Argentina, Brazil, Peru, and Uruguay. Introduced to Florida, USA (established 2010), South Africa (2013), and other regions for . GBIF records also indicate presence in California, Louisiana, and Mississippi.
Diet
Phloem feeder; feeds exclusively on water hyacinth (Pontederia crassipes, formerly Eichhornia crassipes). Both nymphs and feed on plant tissues, causing biotic stress that increases susceptibility to and can lead to plant death and sinking under heavy .
Host Associations
- Pontederia crassipes - plantformerly Eichhornia crassipes; monophagous association
Life Cycle
, five nymphal instars, and . Eggs are deposited in leaf petioles and stolons of water hyacinth. Nymphal development occurs entirely on the plant. Multiple per year occur in suitable climates. Adults exhibit wing dimorphism: either brachypterous (wingless) or (winged), with wing form influenced by insect and host plant quality.
Behavior
Exhibits -dependent wing dimorphism where crowding and declining quality favor production of () forms. Subject to by native in introduced ranges.
Ecological Role
agent that reduces water hyacinth and reproductive capacity in invaded freshwater . Serves as prey/ for native in introduced ranges, potentially affecting control efficacy.
Human Relevance
agent for management of water hyacinth, one of the world's most problematic aquatic weeds. Used in integrated weed management programs to reduce herbicide dependence and mechanical removal costs.
Sources and further reading
- BugGuide
- Wikipedia
- GBIF taxonomy match
- iNaturalist taxon
- NCBI Taxonomy
- Catalogue of Life
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