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Fig. 14. Scheme of cooption of sutural ridges of two elytra in formation of the
lock. (A) Transverse section across two closed elytra. Locks: FL, frictional
to the metepisternum; SL, sutural clamp between elytra; SSL, subsutural click
to the metanotum. (B) Parts of the sutural lock in closed elytra. (C)
Direction of engagement by Fiori
(1975). (D) Direction of
engagement according to the present study.