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Species Acentria ephemerella - Water Veneer - Hodges#5299

Illinois  Data Point - Acentria ephemerella Small white bug/ Mayfly or Aphid? - Acentria ephemerella Water Veneer - Acentria ephemerella - male Moth - Acentria ephemerella Water Veneer - Acentria ephemerella - male Water Veneer  - Acentria ephemerella - male Water Veneer - Acentria ephemerella - male Acentria ephemerella
Show images of: caterpillars · adults · both
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Pyraloidea (Pyralid and Crambid Snout Moths)
Family Crambidae (Crambid Snout Moths)
Subfamily Acentropinae
Tribe Acentropini
Genus Acentria
Species ephemerella (Water Veneer - Hodges#5299)
Hodges Number
Other Common Names
Milfoil Moth
Synonyms and other taxonomic changes
formerly Acentria nivea, Acentropus niveus, Phryganea nivea
the only species in this genus in North America
wingspan 10-17 mm
adult females are wingless and stay on the water surface; adult males have a bare grayish thorax and satiny white or pale gray wings
throughout Eurasia and eastern North America, spreading westward at least to Alberta
larvae and adult females are aquatic; adult males are found near standing or slow-moving water containing the larval food plants, but may be attracted to light at distances far from water
adult males fly from June to August
larvae feed on Eurasian watermilfoil, pondweeds (Potomogeton spp.) and Canadian waterweed (Elodea canadensis).
Life Cycle
larvae are aquatic and overwinter underwater in cases attached to milfoil leaves; females are wingless and stay on the water surface where they breed with winged males in midsummer; univoltine (one generation per year)
Native to Eurasia; introduced to North America in the 1920s. Attempts to use the larvae as biological control agents in the control of watermilfoil in North America have had mixed results.
Internet References
live adult male image and common name reference (Jeff Higgott, UK)
adult male image (
live adult female and eggs image (
biology and history and synonyms (U. of Minnesota)
pinned adult male image and synonym (Swedish Natural History Museum)
presence in Alberta; PDF list (Charles Bird, Moths of the Gaetz Lakes Sanctuary, Alberta)