Abstract
Larvae of Stenacron interpunctatum (Ephemeroptera:Heptageniidae) were observed feeding under naturalistic conditions using macroscopic video techniques. The stereotypic feeding behavior is depicted as a cycle consisting of stages of coordinated movement of the entire suite of mandibulate mouthparts. Depending on experimental conditions this behavioral cycle was modified to enable individuals to brush loosely accreted material from the substratum, gather detritus from deposits, or passively filter detritus from the current. Larvae were most successful in feeding on loose particles of detritus. When presented with attached algae, larvae would attempt to brush the material from the substratum using the labial and maxillary palps with little success in removing tightly accreted material. Feeding observations combined with field and laboratory data on gut content and microhabitat distribution data suggest that S. interpunctatum larvae are opportunistic collectors (gatherers).
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