The denticles (

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The denticles on the tarsal claw of this Ephemerella nymph are highlighted in red.

Denticle: Small tooth-like projects, often appearing like serrations on the tarsal claws of certain mayfly nymphs.) on the tarsal claw (Tarsal claw: The claws at the tip of the tarsus, on an insect's "foot.") of this Ephemerella nymph are highlighted in red.

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