The upper surface of the elytron is sharply folded inwards at intervals, so as to give rise to a regular series of external longitudinal furrows (striae) and to form a set of supports between the two chitinous layers forming the elytron. [Please select]
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Axis: a small process at base of elytron, upon which it turns. [Please select]
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Complicant: when one elytron extends over the other and partially covers it. [Please select]
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