Acentria ephemerella

800720.00 — 5299 — Acentria ephemerella ([Denis & Schiffermüller], 1775) — Water Veneer
Images copyright: Ilona Loser (WI)

Larval Host(s)

Presumed main host
on Block Island:

Known hosts:

Myriophyllum spicatum, Elodea

Sex Differences

Female wingless.

Life History

Males of this interesting introduced species, which has been used as a biological control of the invasive watermilfoil (Myriophyllum spicatum), may be found flying on the surface of Sachem Pond at least from late June to early July and occur in at least one other pond locally. The females are wingless, and mating occurs on the water surface. Larvae are aquatic.


  • Species Page at Moth Photographers Group
  • Barcode of Life (BOLD) - Caution: Some specimens shown may not be sequenced. DNA barcode provides evidence of relatedness not proof of identification.
  • Species Page at BugGuide
  • USGS