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Arthropod Class Insecta (Insects)

Mayflies

Caddisflies

Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

Order in Insecta
ColeopteraBeetles	0	1
DipteraTrue Flies	0	9
EphemeropteraMayflies	0	67
HemipteraTrue Bugs	0	7
HymenopteraAnts, Bees, and Wasps	0	0
LepidopteraMoths	0	0
MegalopteraHellgrammites, Dobsonflies, and Alderflies	0	0
Odonata-AnisopteraDragonflies	0	0
Odonata-ZygopteraDamselflies	0	0
OrthopteraGrasshoppers and Crickets	0	0
PlecopteraStoneflies	0	6
Psocodea	0	0
TrichopteraCaddisflies	0	55

1 order isn't included.

Common Name

Match	Common Name
	Insects

Pictures Below ↓

This is page 82 of specimens of Insecta. Visit the main Insecta page for:

The behavior and habitat of Insecta.
114 underwater pictures of Insecta.

Pictures of 1229 Insect Specimens:

Specimen Page:1...818283...124

Taenionema (Willowflies) Stonefly Nymph

View 11 PicturesThis specimen was the only one of its kind in my kick net sample from this small creek. At first I thought it was Nemouridae, but it's not. Unfortunately, there is no species key available for Taenionema nymphs. Potential species found in Washington include nigripenne, oregonense, pacificum, and pallidum.

Collected April 12, 2021 from Holder Creek in Washington
Added to Troutnut.com by Troutnut on April 13, 2021

Male Hydropsyche occidentalis (Spotted Sedge) Caddisfly Adult

View 6 PicturesDave Ruiter identified this specimen from pictures as Hydropsyche occidentalis.

Collected June 30, 2019 from the Madison River in Montana
Added to Troutnut.com by Troutnut on July 17, 2019

Baetisca obesa (Armored Mayfly) Mayfly Nymph

View 10 Pictures

Collected May 6, 2007 from the Neversink River (above reservoir) in New York
Added to Troutnut.com by Troutnut on May 10, 2007

Cinygmula (Dark Red Quills) Mayfly Nymph

View 8 PicturesThis nymph was one of many I collected with vivid white or semi-transparent markings on the front of the head, the sides of the pronotum (Pronotum: The top of the insect prothorax.), and the last abdominal segments.

Collected July 17, 2011 from the Gulkana River in Alaska
Added to Troutnut.com by Troutnut on July 20, 2011

Penelomax septentrionalis Mayfly Nymph

View 3 Pictures

Collected May 13, 2007 from the Delaware River in New York
Added to Troutnut.com by Troutnut on May 18, 2007

Isonychia bicolor (Mahogany Dun) Mayfly Nymph

View 3 Pictures

Collected April 1, 2007 from Mystery Creek #62 in New York
Added to Troutnut.com by Troutnut on April 3, 2007

Female Alloperla (Sallflies) Stonefly Adult

View 9 Pictures

Collected July 9, 2019 from Rock Creek in Montana
Added to Troutnut.com by Troutnut on July 18, 2019

Baetis (Blue-Winged Olives) Mayfly Nymph

View 5 Pictures

Collected June 13, 2019 from the South Fork Snoqualmie River in Washington
Added to Troutnut.com by Troutnut on June 14, 2019

Cinygmula (Dark Red Quills) Mayfly Nymph

View 7 Pictures

Collected July 28, 2019 from Mystery Creek #199 in Washington
Added to Troutnut.com by Troutnut on July 30, 2019

Female Baetis (Blue-Winged Olives) Mayfly Dun

View 4 PicturesI'm guessing this specimen is in the genus Acerpenna because of the very sharp costal process (

The costal process of a Baetidae dun.

Costal process: A bump or point sticking up from the front margin of an insect's wing, usually the rear wing of certain mayflies. It is sometimes called a costal projection.) on her hind wing. I'm guessing pygmaea because it is the most common species.

Editor note: Not Acerpenna. This is most likely Baetis. See comments on this male specimen for rationale. Also compare with the female specimen associated with it.

Collected July 1, 2005 from the Bois Brule River in Wisconsin
Added to Troutnut.com by Troutnut on April 22, 2006

Specimen Page:1...818283...124

Jargon Defined:

The costal process of a Baetidae dun.

Costal process: A bump or point sticking up from the front margin of an insect's wing, usually the rear wing of certain mayflies. It is sometimes called a costal projection.

Nymphs: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).

Pronotum: The top of the insect prothorax.