Figure 5 in Improving knowledge of the cyclorrhaphan larva (Diptera)

Figure 5. Cibarial ridges and head skeleton pump in the basal sclerites of cyclorrhaphan larvae, mandibles to the left. a, head skeleton in situ, third stage larva of Alipumilio femoratus Shannon (Diptera, Syrphidae), ventro-lateral view, 1 = mandibles, 2 = cibarial ridges on the floor of the basal sclerite; b, Eumerus sp. Meigen (Syrphidae), lateral view, 3 = pharynx running along the floor of the basal sclerite, 4 = valve at the rear of the upturned ventral cornu, 5 = bands of muscle originating on the dorsal cornu and inserting on the roof of the pharynx and the ventral cornu that operate the pump, specimen prepared and donated by C.J. Hartley to the National Museums, Scotland.