There are several species of caddisfly larvae and Ephemerella nymphs on this rock.  In this picture: Mayfly Species Ephemerella subvaria (Hendrickson) and Insect Order Trichoptera (Caddisflies). From the Namekagon River in Wisconsin.
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There are several species of caddisfly larvae and Ephemerella nymphs on this rock.
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson) and Insect Order Trichoptera (Caddisflies).

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