**Mayfly Species Eurylophella lutulenta (Chocolate Dun)**

Mayflies

Caddisflies

Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)

» Genus Eurylophella (Chocolate Duns)

» Species lutulenta (Chocolate Dun)

Common Name

Match	Common Name
	Chocolate Dun

The only account of this species I've found in angling literature is in the Leonards' Mayflies of Michigan Trout Streams. They remark that it is the size of Ephemerella subvaria, much larger than any Eurylophella nymphs I've collected, and its color is a "rather bright yellowish-brown."

Where & When

Regions: East, Midwest

Time Of Year (?): Late May through early June

Preferred Waters: Lakes and large rivers

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Jargon Defined:

Nymphs: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).

Useful References:

Leonard, Justin W. and Fannie A. Leonard. 1962. Mayflies of Michigan Trout Streams. Cranbrook Institute of Science.