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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.

Mystery Creek # 199 in Washington

Stream photos

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Female Skwala (Large Springfly) Stonefly AdultFemale Skwala (Large Springfly) Stonefly Adult
Lateral view of a Female Skwala (Perlodidae) (Large Springfly) Stonefly Adult from Mystery Creek #308 in Washington
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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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Post pictures and ask questions of experts to help learn about aquatic insect identification.
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Topic
Replies
Last Reply
Syrphidae to identify...
Aug 18, 2015 by Pilonm
2
Aug 30, 2015
by Pilonm
Caddis larvae and large adult fly ? Some sort of Caddis larva? Any help would Be appreciated.
Jul 24, 2015 by CenCaAngler
7
Aug 2, 2015
by Entoman
Stonefly identification [Page: 1, 2]
Dec 20, 2014 by Uppersac
20
Jul 22, 2015
by Millcreek
Oecetis sp. larvae and pupae
+ 3

Jul 5, 2015 by Millcreek
9
Jul 7, 2015
by Millcreek
Need help identifying!!
Jun 26, 2015 by Jsawatzky
5
Jul 5, 2015
by Creno
Nectopsyche larva and pupa Larvae 12 mm. Case 22 mm. Pupal case 17 mm. Pupa !3 mm. Pupa 13 mm. Pupa 13 mm.
Jun 18, 2015 by Millcreek
7
Jun 19, 2015
by Oldredbarn
On 6/15 these mayflies closed a bridge in Pennsylvania - What are they? News reports said there were piles of these mayflies two feet deep in Wrightsville, PA.
Jun 17, 2015 by KennyBruin
2
Jun 17, 2015
by KennyBruin
Perlid identification assistance request
Jun 14, 2015 by Tsali
9
Jun 17, 2015
by Oldredbarn
what pattern is this?
May 13, 2015 by Stawheed
3
May 14, 2015
by Stawheed
Callibaetis sp.
+ 2
Female. Callibaetis sp. 7mm excluding cerci. Female. Callibaetis sp. 7mm excluding cerci. Female. Callibaetis sp. 7mm excluding cerci. Female. Callibaetis sp. 7mm excluding cerci. Male. Callibaetis sp. 6mm excluding cerci.
Apr 28, 2015 by Millcreek
6
Apr 30, 2015
by PaulRoberts
Lepidostoma sp.
+ 5
Late instars of panel case type. 11 mm larvae, 13 mm case. Late instars of panel case type. 11 mm larvae, 13 mm case. Early instars, panel case, 4-6 mm larvae and cases. Panel case larvae. 11 mm Turret case 8 mm. Larva 7mm.
Apr 19, 2015 by Millcreek
6
Apr 19, 2015
by Millcreek
Mayfly nymph ID help.
Apr 10, 2015 by Quagmireage
5
Apr 11, 2015
by Quagmireage
Siphlonurus sp. Intermediate nymph. About 15 mm (excluding cerci). Intermediate nymph. About 15 mm (excluding cerci). Ventral view of nymph shown in photo above. Mature nymph. About 16 mm (excluding cerci). Mature nymph. About 16 mm (excluding cerci).
Apr 1, 2015 by Millcreek
0
Psychoglypha sp. larvae
+ 2
Intermediate instar. Approximately 10 mm. case length. Intermediate instar. Approximately 10 mm. case length. Late instars. Approximately 20 mm. Late instar. Approximately 20 mm. Side sclerites. One way to distinguish from other species.
Mar 23, 2015 by Millcreek
10
Mar 25, 2015
by Jmd123
please identify these insecets! salmon river ct
Mar 21, 2015 by Pookie025
3
Mar 22, 2015
by Pookie025
Farmington River Mayfly
Apr 29, 2009 by Phels29
2
Feb 25, 2015
by Byhaugh
Gumaga sp. Larvae are 10 mm. Cases 11 mm. Larvae are 10 mm. Cases 11 mm. Larvae are 10 mm. Larvae are 10 mm. Cases 11 mm. Larvae are 10 mm.
Feb 16, 2015 by Millcreek
4
Feb 17, 2015
by Creno
Spinner from recent trip to Patagonia
Feb 12, 2015 by Byhaugh
4
Feb 14, 2015
by Millcreek
Big Pond Midge
Feb 1, 2015 by PaulRoberts
16
Feb 10, 2015
by PaulRoberts
olive midge?
Jan 23, 2015 by JCW355
2
Jan 26, 2015
by Feathers5
need an Id
Jan 15, 2015 by Sandfly
14
Jan 25, 2015
by MiltRPowell
Baetis alius Female. 7 mm. Female. 7mm. Male. 6.5 mm. Male. 6.5 mm.
Jan 24, 2015 by Millcreek
0
Nectopsyche sp. Larva 13 mm. Case 25 mm. Larva 13 mm. Larva 13 mm. Larva 13 mm. Case 25mm Larva 10 mm. Case 20 mm.
Jan 14, 2015 by Millcreek
2
Jan 15, 2015
by Creno
Need ID help please [Page: 1, 2]
Dec 18, 2014 by Gastriper
20
Jan 13, 2015
by Taxon
Ecdyonurus spp, with Symbiocladius parasites
Jan 11, 2015 by Millcreek
5
Jan 11, 2015
by Entoman
Rhithrogena (species?)
Jan 7, 2015 by Millcreek
9
Jan 10, 2015
by Entoman
Mayflies from the Mekong
Jan 5, 2015 by PaulRoberts
7
Jan 7, 2015
by PaulRoberts
Epeorus sp. (longimanus?) Area of the Russian River where the nymphs were collected.
Dec 1, 2014 by Millcreek
9
Dec 14, 2014
by Entoman
Hydropsyche larvae and pupae (californica?)
+ 9
Photo taken December 30, 2013. 15 mm. Photo taken December 30, 2013. 15 mm. Photo taken June 28, 2014. 18 mm. Photo taken June 28, 2014. 18 mm. Photo taken July 13, 2014. Case with prepupa. 11.5 mm. In alcohol.
Aug 5, 2014 by Millcreek
17
Nov 22, 2014
by Millcreek
Fallceon spp.
+ 15
Fallceon quilleri nymph. Mature male. 5.5 mm (excluding cerci). Collected November 11, 2013. Dark variant. Fallceon quilleri nymph. Immature male. 6 mm (excluding cerci). Collected October 29, 2014. Light variant. Fallceon quilleri nymph. Mature female. 7 mm (excluding cerci). Collected March 28, 2014. Light variant. Fallceon quilleri nymphs. Immature females. 6 mm (excluding cerci). Collected October 5, 2014. Fallceon quilleri nymph. Mature female. 7 mm (excluding cerci). Collected March 28, 2014. Dark variant.
Nov 11, 2014 by Millcreek
4
Nov 21, 2014
by Millcreek
Ironodes sp. Ironodes nymph. 11 mm (excluding cerci). Collected May 11, 2010. In alcohol. Ironodes nymph. 11 mm (excluding cerci). Collected May 11, 2010. In alcohol. Ironodes nymph. 11 mm (excluding cerci). Collected May 11, 2010. In alcohol. Ironodes nymph. 11 mm (excluding cerci). Collected May 11, 2010. In alcohol. Ironodes nymph. 11 mm (excluding cerci). Collected May 11, 2010. In alcohol.
Nov 17, 2014 by Millcreek
2
Nov 21, 2014
by Millcreek
Please Identify
Oct 13, 2014 by Lastchance
9
Oct 22, 2014
by Jmd123
Baetis spp.
Jul 16, 2014 by Millcreek
16
Oct 8, 2014
by Millcreek
Live Chimarra pupae Pupal cases. 11 mm. Collected September 30, 2014. Pupal cases. 11 mm. Collected September 30, 2014. Chimarra pupa. 7 mm. Collected September 30, 2014. Chimarra pupae. 7 mm. Collected September 30, 2014.
Sep 30, 2014 by Millcreek
13
Oct 2, 2014
by Millcreek
Nixe species (kennedyi?)
+ 2
Color variation #1. 10 mm (excluding cerci). Live specimen. Collected May 29, 2014. Color variation #1. 7 mm (excluding cerci). Live specimen. Collected May 13, 2014. Color variation #1. 7 mm (excluding cerci). Live specimen. Collected May 13, 2014. Color variation #1. 6 mm (excluding cerci). In alcohol. Collected May 5, 2012. Color variation #1. 6 mm (excluding cerci). In alcohol. Collected May 5, 2012.
Sep 25, 2014 by Millcreek
4
Sep 27, 2014
by Millcreek
March Brown/Quill Gordon? [Page: 1, 2, 3]
+ 3

Jun 7, 2013 by JohnNY
56
Sep 22, 2014
by Taxon
Choroterpes (species?) Females, upper part of photo, male below. July 27, 2014. Male above, female below. September 5, 2014. Female. September 5, 2014. Female. May 17, 2014. Male. May 20, 2014.
Sep 5, 2014 by Millcreek
18
Sep 15, 2014
by Oldredbarn
Petrophila larvae and pupae
+ 2
Larva with case. Larva 11 mm. Case 13 mm. Live specimen. Larva 11 mm. Live specimen. Larva 10 mm. In alcohol. Dorsal view. Larva 10 mm. In alcohol. Ventral view. Larval or pupal case. 13 mm. In alcohol. Dorsal view.
Aug 13, 2014 by Millcreek
18
Aug 27, 2014
by Oldredbarn
More Baetis nymphs
+ 2
Female. November 11, 2013. Female. October 29, 2013. Female. October 29, 2013. Female molting. November 14, 2013. Female. November 21,2013.
Aug 26, 2014 by Millcreek
0
Chimarra larvae and pupae
+ 10
Larva 9 mm. August 16, 2014. Larvae 8 mm. August 16, 2014. Prepupa. Case 10 mm, prepupa 8 mm. August 16, 2014. Live specimen. Dorsal view, case of early pupa. 10 mm. August 16, 2014. Ventral view, case of early pupa. Case 10 mm. Pupa 8.5 mm. August 16, 2014. Live specimen.
Aug 16, 2014 by Millcreek
8
Aug 25, 2014
by Millcreek
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