Additional features that facilitate identification of this distinctive species are provided by Wharton and Marsh (1978). See the Opius page for characters that distinguish this species from other Opius that have been reared from Tephritidae.
Subsequently, Wharton (1988) treated Bracanastrepha as a synonym of Utetes, but later, Wharton (1997) noted that several species included by Fischer (1977) in Bracanastrepha did not fit the restricted definition of Utetes. Among these was bucki. Thus, Wharton (1997) returned the species to the genus Opius.
Opius bucki is een insect dat behoort tot de orde vliesvleugeligen (Hymenoptera) en de familie van de schildwespen (Braconidae). De wetenschappelijke naam van de soort werd voor het eerst geldig gepubliceerd door Costa Lima in 1938.