Western Ameletid Mayfly vs Labrador Minnow Mayfly

Side-by-side species comparison

Attribute Western Ameletid Mayfly Labrador Minnow Mayfly
Scientific Name Ameletus cooki Baetis labradoriensis
Order Ephemeroptera Ephemeroptera
Family Ameletidae Baetidae
Size 8-12 mm 5-8 mm
Habitat Mountains Rivers & Streams
Diet Omnivores Omnivores
Regions North America North America
Conservation Least Concern Least Concern

Western Ameletid Mayfly

A streamlined mayfly found in cold mountain streams of the Pacific Northwest. Nymphs are agile swimmers that dart between cobbles in riffles.

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Did You Know?

Nymphs are strong enough swimmers to move upstream against moderate currents.

Labrador Minnow Mayfly

A small mayfly found in cold northern streams with rapid currents. Nymphs cling to submerged stones and feed on periphyton.

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Did You Know?

Nymphs can complete their development in as little as three weeks during warm summer conditions.