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Journal of Experimental Biology 35,27-38 (1958)
Published by Company of Biologists 1958

The Efficiency of Adaptive Structures in the Nymph of Rhithrogena Semicolorata (Curtis) (Ephemeroptera)

A. M. STUART ¹

¹ Department of Zoology, University of Glasgow; The Biological Laboratories, Harvard University

1. The current-resisting powers of Rhithrogena semicolorata Curtis have been investigated and measured, and compared with those of Ecdyonurus sp.

2. The part played by the gills as organs of adhesion is considered, and they are found to contribute little to the current-resisting powers of the nymph. The claws are regarded as being of more importance to the animal in clinging than the gills.

3. The dorso-ventral flattening of the animal is considered to be a crevice-seeking adaptation, and not a current-resisting one.