Article,

A biological screw in a beetle's leg

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Science, 333 (6038): 52-52 (July 2011)
DOI: 10.1126/science.1204245

Abstract

The coxa-trochanteral joints on the legs of the weevil Trigonopterus oblongus (Pascoe) work as a biological screw-and-nut system. The apical portions of the coxae closely resemble nuts with well-defined inner threads covering 345°. The corresponding trochanters have perfectly compatible external spiral threads of 410°.

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