Red speckled dun mayfly found at Tilden Regional Park

October 22, 2026

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A Red Speckled Dun mayfly () was recorded at Tilden Regional Park on October 17.¹ Mayfly larvae in Callibaetis are pollution-sensitive aquatic insects requiring clean, well-oxygenated water, indicating that some creeks in the ecosystem still support suitable conditions for these taxa.¹

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