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Small Minnow Mayfly (Callibaetis picta)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Small Minnow Mayfly


Small Minnow Mayflies are tiny meals to the trout that love them and help reveal the presence of pollution in waterways.



Updated: 08/23/2019; Authored By Staff Writer; Content ©www.InsectIdentification.org
Small Minnow Mayflies are a favorite among trout. The fish gobble up the Mayflies when they surface. Because of this, a replica of the Small Minnow Mayfly is one of the more popular artificial baits made for fly fishermen. Small Minnow Mayflies are attracted to water sources and live much of their lives near them. These tiny insects are sensitive to pollution. Even small amounts of it kills a population, so seeing a healthy number of Small Minnow Mayflies means the water is clean. A stream that sees a fast decline in this insect's population may be experiencing some form of chemical pollution.

Small Minnow Mayflies look very much like other Mayflies. The abdomen is tipped with the two long, thin filaments. Two sets of wings allow the Small Minnow Mayfly to fly, though the second set of wings are much smaller than the first set. Wings are transparent, but may also be patterned with opaque black patches around the edges. This species of Mayfly is active during the warm months of the year and ranges throughout the western parts of North America. It produces multiple generations per year and appears more often in the early and middle hours of the day.




Known Diet of the Small-Minnow-Mayfly



waterborne vegetation


General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
Flying insect icon
Helpful insect icon




Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Ephemeroptera
        Family: Baetidae
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          Genus: Callibaetis
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            Species: picta
Identifying Information
Size, Colors, Features
Scientific Name: Callibaetis picta
Other Name(s): Mayfly
Category: Mayfly
Size (Adult; Length): 6mm to 12mm (0.23" to 0.47")
Colorwheel Graphic Colors: white, brown, gray
Descriptors: flying, helpful
Relative Size Comparison
Typical Range Between 6mm and 12mm
Lo: 6mm
Md: 9mm
Hi: 12mm
Territorial Map*
U.S., Canada, and Mexico
State of Alabama graphic
State of Arizona graphic
State of Arkansas graphic
State of California graphic
State of Colorado graphic
State of Delware graphic
State of Florida graphic
State of Georgia graphic
State of Idaho graphic
State of Illinois graphic
State of Indiana graphic
State of Iowa graphic
State of Kansas graphic
State of Kentucky graphic
State of Louisiana graphic
State of Maine graphic
State of Maryland graphic
State of Michigan graphic
State of Minnesota graphic
State of Mississippi graphic
State of Missouri graphic
State of Montana graphic
State of Nebraska graphic
State of Nevada graphic
State of New England graphic
State of New Jersey graphic
State of New Mexico graphic
State of New York graphic
State of North Carolina graphic
State of North Dakota graphic
State of Ohio graphic
State of Oklahoma graphic
State of Oregon graphic
State of Pennsylvania graphic
State of South Carolina graphic
State of South Dakota graphic
State of Tennessee graphic
State of Texas graphic
State of Utah graphic
State of Virginia graphic
State of Washington graphic
State of West Virginia graphic
State of Wisconsin graphic
State of Wyoming graphic
Canadian territory of Alberta graphic
Canadian territory of British Columbia graphic
Canadian territory of Manitoba graphic
Canadian territory of New Brunswick graphic
Canadian territory of Newfoundland and Labrador graphic
Canadian territory of Ontario graphic
Canadian territory of Quebec graphic
Canadian territory of Saskatchewan graphic
Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Alaska  
Hawaii  
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Small Minnow Mayfly may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Small Minnow Mayfly. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.

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