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A few (not all) of the abdominal tubercles (

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A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled. They are especially large in this species.

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 Ephemerella needhami nymph are circled. They are especially large in this species.

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