Small Rivulet vs Trico Mayfly

Side-by-side species comparison

Small Rivulet

A delicate small moth found in damp habitats where hemp agrimony grows. The larvae feed inside the flowers. Has subtle grey and white wing markings.

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The larvae develop entirely within hemp agrimony flower heads, emerging only to pupate.

A tiny mayfly that forms enormous morning spinner falls over calm streams and rivers. Males have distinctive white bodies with black thoraxes.

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Trico spinner falls create such dense blankets of spent mayflies on the water surface that trout gorge themselves to satiation.