Billaea triangulifera

{{short description|Species of fly}}

{{Speciesbox

| image = Billaea triangulifera 01.jpg

| image_caption = Billaea triangulifera

| display_parents = 3

| genus = Billaea

| species = triangulifera

| authority = (Zetterstedt, 1844){{cite journal |last1=Zetterstedt |first1=J.W. |title=Diptera Scandinaviae disposita et descripta |journal=Tomus Tertius |date=1844 |volume=Officina Lundbergiana, Lundae [= Lund.] |pages=895–1280}}

| synonyms = *Asbella ruficornis Robineau-Desvoidy, 1863{{cite book |last= Robineau-Desvoidy|first= Jean-Baptiste |date= 1863 |title= Histoire naturelle des dipteres des environs de Paris. |url= https://archive.org/download/histoirenaturell02robi/histoirenaturell02robi.pdf|publisher= Masson et Fils, Paris.|volume= Tome second|pages= 1–920 |access-date=15 February 2015}}

• Billaea trigonota Kolomiets, 1966{{cite journal |last1=Kolomiets |first1=N.G. |title=Parasitic Diptera of subfam. Dexiinae (Dipt. Larvaevoridae). Genera Phorostoma and Billaea in the fauna of the USSR |journal=Novye i Maloizvestnye Vidy Fauny Sibiri |date=1966 |volume=1966 |pages=57–104}}
• Billaea tsherepanovi Kolomiets, 1966
• Dexia triangulifera Zetterstedt, 1844

}}

Billaea triangulifera is a species of fly in the family Tachinidae.{{cite web |last1=O’Hara |first1=James E. |last2=Henderson |first2=Shannon J. |first3=D. Monty |last3=Wood |title=Preliminary Checklist of the Tachinidae (Diptera) of the World|url=http://www.nadsdiptera.org/Tach/WorldTachs/Checklist/Tachchlist_ver2.1.pdf |website=Tachinidae Resources |access-date=16 December 2023 |date=5 March 2020}} It is a parasitoid of larval Prionus coriarius beetles, piercing the beetle near its spiracles.{{cite journal |last1=Zaemdzhikova |first1=Gergana |last2=Topalov |first2=Pavel |last3=Doychev |first3=Danail |last4=Hubenov |first4=Zdravko |last5=Georgiev |first5=Georgi |title=New parasitoids of longhorn beetles (Coleoptera: Cerambycidae) in Bulgaria |journal=Acta Zoologica Bulgarica |date=2019 |volume=79 |issue=2 |url=https://www.researchgate.net/publication/334063885 |access-date=20 June 2022}}