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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
Baetis

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.

For how many years, I wonder, have these huge slabs of rock sheltered wild brook trout? From Mystery Creek # 89 in New York

Stream photos

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Amphizoa Beetle LarvaAmphizoa Beetle Larva
Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington
This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
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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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Mayfly Genus Leucrocuta

The species of this genus are relatively unimportant, but Leucrocuta hebe and Leucrocuta aphrodite may produce fishable hatches. They have the same general biology as Heptagenia.

Where & when

In 246 records from GBIF, adults of this genus have mostly been collected during June (35%), July (32%), August (21%), and May (7%).

In 67 records from GBIF, this genus has been collected at elevations ranging from 3 to 6332 ft, with an average (median) of 2362 ft.

Genus Range
Map of specific collection sites

Specimens of the Mayfly Genus Leucrocuta

3 Female Duns
2 Male Spinners
2 Female Spinners
4 Nymphs

Start a Discussion of Leucrocuta

References

Mayfly Genus Leucrocuta

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Ephemeroptera (Mayflies)
  5. » Family Heptageniidae (March Browns, Cahills, Quill Gordons)
  6. » Genus Leucrocuta
Species in Leucrocuta
Leucrocuta aphroditePale Evening Duns
0
0
Leucrocuta hebeLittle Yellow Quills
11
58
Leucrocuta juno
0
0
Leucrocuta maculipennis
0
0
Leucrocuta minerva
0
0
Leucrocuta thetis
0
0
Leucrocuta umbratica
0
0
Leucrocuta walshi
0
0
Species in Leucrocuta: Leucrocuta aphrodite, Leucrocuta hebe, Leucrocuta juno, Leucrocuta maculipennis, Leucrocuta minerva, Leucrocuta thetis, Leucrocuta umbratica, Leucrocuta walshi
2 species (Leucrocuta jewetti and Leucrocuta petersi) aren't included.
Genus Range
Map of specific collection sites
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