After the thickened cuticle of the post-oesophageal lumen wall, the cuticle folds to form the outlet valves, 'valvulae', with attached, controlling oblique muscles.
From theCambridge English Corpus
There is general consensus of monophyly in this superorder, based on reduction of the secondvalvulae, an ovipositor derived from the gonoplac, and an enlarged precostal region on the forewing.
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