About Evania appendigaster (Linnaeus, 1758)
Evania appendigaster is one of the larger species of ensign wasps. Its forewings can reach up to approximately 7 millimeters in length. This species can be distinguished from other ensign wasps by the wide separation between the first and second sections of the coxa, the leg segment that connects the leg to the body. Its body is solid black, and it has contrasting blue eyes. The abdominal petiole – the narrow constricted stalk that holds the posterior section of the abdomen, called the gaster – attaches high on the wasp’s body. The gaster is compressed along its lateral sides, with a shape ranging from oval to nearly triangular. It is held in a flag-like position that resembles an ensign; this shared family characteristic inspired the common name "ensign wasp".
