Last modified: Jan. 9, 2023, 1:53 p.m.
A new species in Belgium in 2017 in WV. Hitherto a very rare and local species.
Endothenia oblongana has been mentioned from several localities in Belgium (first record De Fré Ch. 1858. Catalogue des Microlépidoptères de la Belgique. — Annales de la Société entomologique belge 2: 45–162.)
However, all specimens turned out to be either Endothenia gentianaeana (Hübner, 1799) or Endothenia marginana (Haworth, 1811) (K. Larsen pers. comm.). Until 2017, no Belgian specimen of O. oblongana has been found.
The larva lives in the roots of the host plant.
The adults fly in July and August.
Dunes and flowery dune grasslands.