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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

A beautiful braided reach of the Sag River, with the Philip Smith Mountains in the Arctic National Wildlife Refuge (ANWR) in the background. From the Sagavanirktok River in Alaska

Stream photos

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Isoperla (Stripetails and Yellow Stones) Stonefly AdultIsoperla (Stripetails and Yellow Stones) Stonefly Adult
Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) Stonefly Adult from Mystery Creek #308 in Washington
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27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Caddisfly Genus Micrasema (Little Grannoms)

I have only seen two species of this small genus mentioned in angling books, and neither was said to be anything special.

Where & when

In 308 records from GBIF, adults of this genus have mostly been collected during June (31%), July (24%), May (20%), August (12%), and April (6%).

In 222 records from GBIF, this genus has been collected at elevations ranging from -30 to 8566 ft, with an average (median) of 1742 ft.

Genus Range
Map of specific collection sites

Start a Discussion of Micrasema

Caddisfly Genus Micrasema (Little Grannoms)

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Trichoptera (Caddisflies)
  5. » Family Brachycentridae (Apple Caddis and Grannoms)
  6. » Genus Micrasema (Little Grannoms)
Species in Micrasema
Micrasema bactro
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Micrasema rusticum
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Species in Micrasema: Micrasema bactro, Micrasema rusticum
16 species (Micrasema alexanderi, Micrasema arizonicum, Micrasema bennetti, Micrasema burksi, Micrasema charonis, Micrasema dimicki, Micrasema diteris, Micrasema etra, Micrasema gelidum, Micrasema onisca, Micrasema oregona, Micrasema ozarkana, Micrasema rickeri, Micrasema scotti, Micrasema sprulesi, and Micrasema wataga) aren't included.
Genus Range
Map of specific collection sites
Common Name
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