Abstract
The main objective of the study is to describe in detail morphological structures on the mandibular molae of different larval Ephemeroptera. Therefore, representative samples of species of 80 genera from 28 families have been investigated by scanning electron microscopy. Six basic types of molar surface are differentiated. The respective types of molae differ in the cuticular structures of individual ridges. Relationships between the molar type, feeding categories, and phylogenetic position of individual taxa are discussed. The functional significance of various microstructures on the molar surfaces is explained.
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