Pontederiaceae
Guides
Megamelus
Water Hyacinth Planthopper (for M. scutellaris)
Megamelus is a genus of delphacid planthoppers in the family Delphacidae, comprising at least 30 described species. The genus is widely distributed and primarily associated with freshwater aquatic environments. Several species, particularly M. scutellaris, have been extensively studied as biological control agents for invasive aquatic weeds such as water hyacinth (Pontederia crassipes). The genus exhibits wing dimorphism influenced by population density and host plant quality. Recent phylogenetic studies have clarified interspecific relationships and supported the monophyly of the genus.
Rhysophora
Rhysophora is a genus of shore flies (Diptera: Ephydridae) in the tribe Discomyzini, distributed primarily in the Neotropics with two Nearctic species. The genus was revised in 2015 following discovery of four new Neotropical species, confirming its monophyly and establishing Helaeomyia as its sister group. Species diversity is greatest in South America.