Although the identification is not certain because the nymph is not yet mature, the configuration of tubercles (
Tubercle: Various peculiar little bumps or projections on an insect. Their character is important for the identification of many kinds of insects, such as the nymphs of Ephemerellidae mayflies.) on this one--particularly the forefemora--seems to best match Drunella flavilinea.
A few (not all) of the abdominal tubercles on this Ephemerella needhami
nymph are circled. They are especially large in this species.
This mayfly was collected from the Gallatin River on July 2nd, 2019 and added to Troutnut.com on July 18th, 2019.
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