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**Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph Pictures**

Classification

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Baetidae (Blue-Winged Olives)

» Genus Baetis (Blue-Winged Olives)

» Species tricaudatus (Blue-Winged Olive)

This specimen and many like it were found with other specimens I found to be duller-colored females of the same species. I wasn't aware of such a difference between male and female nymphs in Baetids, but all the morphological characteristics I checked in the key were the same, and the color patterns are, too -- just not the brightness.

This mayfly was collected from the Yakima River on April 9th, 2021 and added to Troutnut.com on April 12th, 2021.

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

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Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

View Full Size and Comment (1.9X larger)

Detached labium and labial palps. Male Baetis tricaudatus (Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

Detached labium and labial palps.

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