Type study showed that Acleris stadiana (Barnes & Busck), currently considered a junior synonym of A. semiannula (Robinson), is in fact a distinct taxon. Although superficially similar, these taxa differ markedly in genital structure. In males of A. semiannula, the aedeagus is short, broad, and virtually straight, whereas in those of A. stadiana, it is long, thin, and sharply bent. What was known in literature as A. semiannula proved to be A. stadiana. We redefine both A. semiannula and the resurrected A. stadiana.
Sabourin, Michael; Priest, Ronald J.; and Miller, William E.
"Nearctic Acleris: Resurrection of A. Stadiana and a Revised Identity for A. Semiannula (Lepidoptera: Tortricidae),"
The Great Lakes Entomologist: Vol. 30
, Article 1.
Available at: https://scholar.valpo.edu/tgle/vol30/iss2/1