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**Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner Pictures**

Classification

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Heptageniidae (March Browns, Cahills, Quill Gordons)

» Genus Rhithrogena

» Species undulata (Small Western Red Quill)

This male was collected at the same time as this female and is likely the same species.

It keys pretty clearly to Rhithrogena undulata using the key in Traver 1935, although the size is larger than expected for that species in that source.

This mayfly was collected from the Madison River on July 1st, 2019 and added to Troutnut.com on July 18th, 2019.

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Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

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Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (6.7X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (5X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (3.2X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (4.5X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (5.5X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (6.2X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (6.7X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (5.1X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (2.9X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (3.6X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

View Full Size and Comment (3.4X larger)

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner from the Madison River in Montana

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