The inner membrane or lining that lines the inner surface of the shell or exoskeleton in arthropods and mollusks.
From Greek endo- 'within' + pleura 'side' or 'rib.' The term describes a protective inner lining, with pleura historically referring to side membranes.
Beneath a beetle's tough outer shell lies the endopleura—a sensitive inner membrane that helps the insect sense vibrations and pressure changes, essentially giving it a whole sensory system just under its armor.
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