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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.

Stream photos

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Hydropsyche (Spotted Sedge) Caddisfly LarvaHydropsyche (Spotted Sedge) Caddisfly Larva
Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
9 Recently Added Photos
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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  2. Specimen Discussion

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  2. Specimen Discussion

You can create new topics in this section from each specimen's page in the insects section.
Topic
Replies
Last Reply
Holocentropus ID Discussion
Jun 11, 2023 by Fishohio614 in Holocentropus Caddisfly Larva
0
Tying the Flav
Mar 8, 2021 by Lowell in Female Drunella flavilinea Mayfly Dun
1
Mar 11, 2021
by Roguerat
Baetis bicaudatus
Nov 7, 2020 by Taxon in Male Baetis tricaudatus Mayfly Spinner
12
Nov 12, 2020
by Millcreek
Puzzled on this Baetis nymph ID
Nov 10, 2020 by Troutnut in Baetis tricaudatus Mayfly Nymph
2
Nov 12, 2020
by Troutnut
Baetis adult species IDs?
Nov 6, 2020 by Troutnut in Male Baetis tricaudatus Mayfly Spinner
0
Ephemerella nymph
Sep 24, 2020 by Millcreek in Ephemerella aurivillii Mayfly Nymph
0
mean one thing, write another?
Sep 19, 2020 by Creno in Male Onocosmoecus unicolor Caddisfly Adult
2
Sep 20, 2020
by Creno
Stuck on the family ID on this one -- any thoughts?
Sep 19, 2020 by Troutnut in Female Isoperla fusca Stonefly Adult
0
Ventral view
Sep 5, 2020 by Martinlf in Male Ephemerella excrucians Mayfly Dun
1
Sep 6, 2020
by Troutnut
Public service announcement: PMDs aren't yellow
Aug 17, 2020 by Troutnut in Male Ephemerella excrucians Mayfly Dun
13
Aug 28, 2020
by Wiflyfisher
Another horned critter
Aug 17, 2020 by Martinlf in Male Drunella spinifera Mayfly Nymph
0
Fearsome
Aug 14, 2020 by Martinlf in Drunella grandis Mayfly Nymph
1
Aug 14, 2020
by Troutnut
Skwala question
Mar 3, 2013 by Gillybilly in Skwala Stonefly Nymph
6
Feb 20, 2020
by Leskorcala
Siphlonurus sp.
Jan 27, 2020 by Millcreek in Ameletus Mayfly Nymph
1
Feb 2, 2020
by Troutnut
Sare
Jan 28, 2020 by Sare in Isonychia bicolor Mayfly Nymph
0
Ephemerella tibialis
Dec 24, 2019 by Millcreek in Male Serratella micheneri Mayfly Nymph
2
Dec 26, 2019
by Millcreek
Interesting
Sep 2, 2019 by Martinlf in Coleoptera Insect Larva
0
Rhyacophila betteni group
Aug 8, 2019 by Creno in Rhyacophila Caddisfly Larva
2
Aug 10, 2019
by Creno
This appears to be Dixa sp.
Aug 7, 2019 by Creno in Dixa True Fly Larva
1
Aug 8, 2019
by Jmd123
Psocodea
Aug 7, 2019 by Creno in Psocodea Insect Adult
0
Rhyacophila hyalinata group
Aug 7, 2019 by Creno in Rhyacophila vocala Caddisfly Larva
0
Don't think it is Gumaga........
Aug 5, 2019 by Creno in Lepidostoma Caddisfly Larva
1
Aug 6, 2019
by Troutnut
Cool Photo
Aug 5, 2019 by Martinlf in Rhyacophila Caddisfly Pupa
0
Interesting caddisfly for Roger/Taxon
Jul 30, 2019 by Troutnut in Lepidostoma Caddisfly Larva
0
Identification
Sep 5, 2006 by Litobrancha in Rhyacophila fuscula Caddisfly Larva
4
Jul 30, 2019
by Troutnut
Puzzled on this mayfly, not even confident on family
Jul 22, 2019 by Troutnut in Male Rhithrogena hageni Mayfly Spinner
1
Jul 23, 2019
by Millcreek
Hesperoperla or Calineuria
Jul 22, 2019 by Millcreek in Male Calineuria californica Stonefly Adult
2
Jul 22, 2019
by Millcreek
Spinadis simplex
Jul 19, 2019 by Taxon in Female Heptageniidae Mayfly Dun
1
Jul 20, 2019
by Troutnut
Neoleptophlebia
Jul 19, 2019 by Millcreek in Neoleptophlebia Mayfly Nymph
1
Jul 19, 2019
by Troutnut
Neoleptophlebia
Jul 19, 2019 by Millcreek in Neoleptophlebia Mayfly Nymph
0
Neoleptoptphlebia
Jul 19, 2019 by Millcreek in Neoleptophlebia Mayfly Nymph
0
Neoleptophlebia
Jul 19, 2019 by Millcreek in Neoleptophlebia Mayfly Nymph
0
Hesperoperla pacifica
Jul 19, 2019 by Millcreek in Hesperoperla pacifica Stonefly Nymph
0
Sweltsa?
Jul 17, 2019 by Taxon in Female Sweltsa Stonefly Adult
1
Jul 17, 2019
by Troutnut
Anyone able to ID this Chloroperlid?
Jul 17, 2019 by Troutnut in Female Sweltsa Stonefly Adult
0
Lifestage
Jun 24, 2019 by Taxon in Male Ephemera simulans Mayfly Dun
1
Jul 2, 2019
by Troutnut
Hydropsyche species
Jun 14, 2019 by Creno in Male Hydropsyche Caddisfly Adult
2
Jun 14, 2019
by Creno
Limnephilus externus
Jun 14, 2019 by Creno in Male Limnephilus externus Caddisfly Adult
0
Lepidostoma
Jun 14, 2019 by Creno in Male Lepidostoma Caddisfly Adult
0
Amiocentraus aspilus male
Jun 14, 2019 by Creno in Amiocentrus aspilus Caddisfly Adult
0
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