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**Male Maccaffertium ithaca (Light Cahill) Mayfly Dun Pictures**

Classification

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

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

» Genus Maccaffertium (March Browns and Cahills)

» Species ithaca (Light Cahill)

Based on the identical size, shape, and relative proportions of different body parts, I'm pretty sure this dun is of the same species as two spinners I collected at about the same time. The color is dramatically different, but that's to be expected with many of these species in the transition from dun to spinner.

This mayfly was collected from the West Branch of the Delaware River on June 7th, 2007 and added to Troutnut.com on June 8th, 2007.

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Male Maccaffertium ithaca (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York

CameraCanon EOS 20D

View Full Size and Comment (2X larger)

Male Maccaffertium ithaca (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York

CameraCanon EOS 20D

View Full Size and Comment (2X larger)

Male Maccaffertium ithaca (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York

CameraCanon EOS 20D

View Full Size and Comment (2X larger)

Male Maccaffertium ithaca (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York

CameraCanon EOS 20D

View Full Size and Comment (2X larger)

Male Maccaffertium ithaca (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York

CameraCanon EOS 20D

View Full Size and Comment (2X larger)

Male Maccaffertium ithaca (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York

CameraCanon EOS 20D

Recent Discussions of this Dun

Cahills 12 Replies »

Posted by Dryfly on Jun 5, 2010

Last reply on Jun 11, 2010 by Wiflyfisher

Do Cahills ever come off in enough numbers for a rise to occur? Around here, they trickle off annoyingly, and never get much trout attention.I am wondering about this, cause I saw some spinners at a DQ last night. Are they ever real important?

Start a Discussion of this Dun:

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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.

Spinner: There are two winged stages of adult mayflies. They emerge from the water as duns, molt on land (usually) into their fully mature stage, spinners. As spinners, they mate, lay eggs, and die.

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