Callibaetis pictus
(Eaton, 1871)
Speckled Dun
Callibaetis pictus is a small minnow mayfly in the Baetidae, commonly known as the Speckled Dun. It is distributed across Central America and North America, including all of Mexico and the northern and southwestern United States. Like other mayflies, it has an aquatic nymphal stage lasting months to years, followed by a brief lifespan measured in hours to days. The is part of the EPT index (Ephemeroptera, Plecoptera, Trichoptera) used to assess water quality in environmental monitoring.
Pronunciation
How to pronounce Callibaetis pictus: //ˌkælɪˈbeɪtɪs ˈpɪktəs//
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Habitat
Aquatic environments including streams, rivers, and lakes. The nymphs inhabit freshwater systems where they develop underwater.
Distribution
Central America and North America. In North America, the range includes all of Mexico, the northern United States, and the southwestern United States.
Ecological Role
Callibaetis pictus serves as an for water quality assessment. As a member of the EPT index (Ephemeroptera, Plecoptera, Trichoptera), its presence and diversity in a watershed correlates with healthy aquatic conditions. nymphs are sensitive to pollutants, turbidity, and elevated water temperatures, making them valuable bioindicators for environmental monitoring programs.
Human Relevance
The holds significance for anglers, as mayflies are a critical food source for fish and the basis for fly-fishing imitations. The "Speckled Dun" reflects its use in angling culture, where "dun" refers to the subimago stage that fly fishers model their artificial flies after.