Mayfly Species Epeorus frisoni

Mayflies

Caddisflies

Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

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

» Genus Epeorus (Little Maryatts)

» Species frisoni

Pictures Below ↓

This is a very uncommon species. The identification of all the specimens I've placed in this section is actually very uncertain, as they have proven incredibly difficult to identify. A professional entomologist collected more specimens from this stream, raised some nymphs, and did some genetic tests, and it's still uncertain. This reflects the ambiguity in the definitions and descriptions of many mayfly species.

Where & When

Region: East

Preferred Waters: Cold

Altitude: High

Pictures of 4 Mayfly Specimens in the Species Epeorus frisoni:

Specimen Page:12

Male Epeorus frisoni Mayfly Dun

View 9 PicturesI collected this male dun together with a female spinner, a female dun, and another male dun.

Collected September 6, 2006 from Mystery Creek #23 in New York
Added to Troutnut.com by Troutnut on October 3, 2006

Female Epeorus frisoni Mayfly Spinner

View 8 PicturesI collected this female spinner together with a male dun, a female dun, and another male dun.

Collected September 6, 2006 from Mystery Creek #23 in New York
Added to Troutnut.com by Troutnut on October 3, 2006

Female Epeorus frisoni Mayfly Dun

View 7 PicturesI collected this female dun together with a female spinner, a male dun, and a larger, damaged male dun.

Collected September 6, 2006 from Mystery Creek #23 in New York
Added to Troutnut.com by Troutnut on October 3, 2006

Specimen Page:12

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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.

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).

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.