Billaea triangulifera is a species of fly in the family Tachinidae.[4] It is a parasitoid of larval Prionus coriarius beetles, piercing the beetle near its spiracles.[5]
^ abKolomiets, N.G. (1966). "Parasitic Diptera of subfam. Dexiinae (Dipt. Larvaevoridae). Genera Phorostoma and Billaea in the fauna of the USSR". Novye i Maloizvestnye Vidy Fauny Sibiri. 1966: 57–104.