Anterior edge of tegmen or phallobase without struts. The rounded tegmen which resembles the elytra of beetles are often patterned. Usually parts of the testa or tegmen form a hard protective mechanical layer. There are five long, often branched, rays attached round the edge of the tegmen. A tegmen ("small leathery dome") covered the mouth and topped the cup. The inner epiderm is also called a tegmen. The right tegmen lobe is bright orange-yellow. They have a flexible column, an unusual holdfast, tegmen appendages and minute arms. "Zeta Cancri" bore the traditional name "Tegmine" ("Tegmen") "the shell (of the crab)". The roof of the tympanic cavity, the tegmen tympani, is small. In higher gall flies, the parameres and tegmen are not developed. The tegmen tympani, the roof of the tympanic cavity, is reduced.