Larva ID Tips: Mayflies

Mayfly larvae have 2-3 cerci or “tails,” and gills can be seen alongside or under the abdomen.

Figure 8.7: Mayfly larva. Image from URL:

Figure 8.C: Mayfly larva.
Image from URL:


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The MSP project is funded by an ESEA, Title II Part B Mathematics and Science Partnership Grant through the Montana Office of Public Instruction. MSP was developed by the Clark Fork Watershed Education Program and faculty from Montana Tech of The University of Montana and Montana State University, with support from other Montana University System Faculty.