Opius wesmaelii Haliday, 1837: 203 –221
Biosteres (Chilotrichia) wesmaelii Fischer, 1972: 1 –620.
Distribution in Turkey. Afyon (Fischer & Beyarslan, 2005 a); Artvin, Ordu, Sivas (Beyarslan & Fischer, 2011); Bartin, Giresun, Rize, Trabzon, Tunceli, Yozgat (Fischer & Beyarslan, 2012)
Distribution. Palaearctic. Austria, Belgium, Bulgaria, China, Czechoslovakia, Denmark, Estonia, Finland, France, Germany, Hungary, Ireland, Italy, Lithuania, Netherlands, Poland, Russia, Sweden, Switzerland, Turkey, United Kingdom.
Hosts. Diptera. Anthomyiidae: Delia quadripilia (Stein, 1916) [Honckenya peploides]; Pegomyia betae (Curtis, 1847 ) and P. hyoscyami (Panzer, 1809) [Beta vulgaris]; P. hyoscyami Panzer 1809 [Hyoscyamus niger]; P. nigritarsis (Zetterst, 1838).