THE MORPHOLOGY AND FUNCTIONING OF THE MOUTHPARTS OF CHLOEON DIPTERUM L. AND BAETIS RHODANI PICTET (INSECTA, EPHEMEROPTERA)*

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Abstract
The morphology of the mouthparts of Chloeon dipterum L. and Baetis rhodani Pictet is described and the manner of functioning of the mouthparts is interpreted on the basis of their morphology and direct observations of feeding larvae. In C. dipterum the way in which the mouthparts were used depended upon the nature of the food material. The ways in which the mouthparts of B. rhodani differ from those of C. dipterum are shown to be consistent with the overall adaptation of the former species to flowing water.

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