Cossyphus

Cossyphus, also occasionally spelled Cossus, is a genus of flies belonging to the family Asilidae, the robber flies. These flies are predatory, typically ambushing other insects from perches and injecting them with saliva containing paralyzing and proteolytic enzymes, allowing them to consume the liquefied remains. Cossyphus flies are found in various parts of the world, primarily in warmer climates.

While the genus itself is not overwhelmingly prominent in entomological literature, it holds its place within the larger context of Asilidae, a diverse and ecologically important family of flies. Distinguishing characteristics often involve specific details of their morphology, such as the arrangement of bristles on the legs and thorax, wing venation, and the structure of the male genitalia. Specific identification to the species level usually requires examination by a trained entomologist.

The ecological role of Cossyphus, like other robber flies, is significant in regulating insect populations. As predators, they contribute to the control of various insect species, including potential agricultural pests. Their presence can be an indicator of a healthy and diverse ecosystem.

The classification of Cossyphus within Asilidae has sometimes been subject to revision and debate as new taxonomic data becomes available. Further research, particularly utilizing molecular methods, may lead to adjustments in the understanding of the relationships within the genus and within the broader Asilidae family.