Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph Pictures

Mayflies

Caddisflies

Stoneflies

Classification

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

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

» Genus Ephemerella (Hendricksons, Sulphurs, PMDs)

» Species excrucians (Pale Morning Dun)

This mature nymph is associated with the dun from the same location and date posted on this hatch page. Size 10mm.

This mayfly was collected from the Fall River on November 12th, 2011 and added to Troutnut.com on December 15th, 2011.

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Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph from the Fall River in California

AuthorEntoman

CameraCanon PowerShot A490

View Full Size (2.2X larger)

AuthorEntoman

CameraCanon PowerShot A490

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Jargon Defined:

Dun: Mayflies have two adult stages. They first emerge from the water as duns (scientifically known as the subimago stage). They then molt into the spinner (imago) stage, in which they mate and die. Sometimes the word "dun" is confusingly used to refer to a brownish gray color in fly tying materials.

Nymph: 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).