**Female Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Dun 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 dorothea infrequens (Pale Morning Dun)

Size: 10mm. At emergence the specimen was a fairly bright olive green and there was obvious difference in color between the forewing (med. dun) and the hind-wing (pale cream). It was really noticeable as they floated by. You can just make these features out in the second photo, but not so much in the first that was taken 24 hours after capture. Total time from emergence to molting - approx. 48 hours.

Entoman

This mayfly was collected from the Fall River on October 16th, 2011 and added to Troutnut.com on October 21st, 2011.

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Female Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Dun from the Fall River in California

AuthorEntoman

CameraCanon PowerShot A490

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AuthorEntoman

CameraCanon PowerShot A490

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AuthorEntoman

CameraCanon PowerShot A490

Recent Discussions of this Dun

Great Bug Photos 2 Replies »

Posted by Martinlf on Jan 12, 2012

Last reply on Jan 13, 2012 by Entoman

Thanks for adding these!

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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.

Emergence: The transformation of a nymph or pupa into the adult winged stage of an insect. The term may refer to the emergence of an individual, or the daily or yearly event in which all individuals of a species emerge.

Molting: When aquatic insects with hard exoskeletons (like mayfly and stonefly nymphs) grow bigger, their exoskeleton does not grow with them. Instead they grow a new, larger one underneath and shed the old one when it's too small. This process is called molting.