The legs of riffle beetles hold onto underwater substrates in fast currents using large, strong terminal claws.

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"The tarsi of aquatic insects all have terminal claws. In riffle beetles, the claws are large and stout. This enables them to retain their position even at high current velocities." (Giller and Malmqvist 1998:115)

The Biology of Streams and Rivers (Biology of Habitats Series)Oxford University Press, USAFebruary 18, 1999
Paul S. Giller

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