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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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 Nyctiophylax (Dinky Light Summer Sedges)

Where & when

In 208 records from GBIF, adults of this genus have mostly been collected during June (37%), July (33%), May (14%), and August (13%).

In 76 records from GBIF, this genus has been collected at elevations ranging from 7 to 7201 ft, with an average (median) of 1841 ft.

Genus Range

Hatching behavior

Time of day : Slow water

The pupae take a long time to break through the film.

Egg-Laying behavior

Females lay their eggs underwater, either by diving through the surface or crawling down streamside rocks and twigs.

Larva & pupa biology

Current speed: Slow

Shelter type: Unusual retreat; see notes

These caddisflies build unusual homes, which Gary LaFontaine describes in detail in Caddisflies:

The small, yellow-and-brown larvae of this genus builds a chamberlike retreat, open at both ends, over a hollow in a stick or rock. It leaves loose threads over each opening and when a smaller animal touches the retreat, disturbing the threads, this eight- to ten-millimeter carnivore rushes out and seizes its prey.

Specimens of the Caddisfly Genus Nyctiophylax

1 Adult

Start a Discussion of Nyctiophylax


  • LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.
  • Morse, JC. 1972. The genus Nyctiophylax in North America. Journal of the Kansas Entomological Society 42(2): 172-181.
  • Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.

Caddisfly Genus Nyctiophylax (Dinky Light Summer Sedges)

7 species (Nyctiophylax banksi, Nyctiophylax barrorum, Nyctiophylax denningi, Nyctiophylax morsei, Nyctiophylax serratus, Nyctiophylax uncus, and Nyctiophylax vestitus) aren't included.
Genus Range
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