Wikipedia
Polypedilum
Polypedilum is a genus of non-biting midges in the subfamily Chironominae of the bloodworm family Chironomidae. This is probably the most species-rich of all chironomid genera. Larvae of Polypedilum may also be among the most abundant invertebrates in euthrophic ponds, reaching densities of up to 1200 larvae per square meter.