The structure of the cephalic foregut of Neopachygaster (Diptera, Stratiomyidae, Pachygasterinae)

The cephalic portion of the foregut of Neopachygaster is clearly subdivided into the pharynx and oesophagus. The precerebral pharynx is transformed into a well-developed anterior pharyngeal pump with two unpaired dilators and an intrinsic layer of the muscle fibers. There are two pairs of the posterior pharyngeal dilators, attached to the pharynx just behind the brain. According to these features, the pharynx of Neopachygaster has the most plesiomorphic structure among all the members of Stratiomyidae studied so far.