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Animal Phylum Arthropoda (Arthropods)

Mayflies

Caddisflies

Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

Class in Arthropoda
ArachnidaMites and Spiders	0	1
CollembolaSpringtails	0	0
Crustacea-MalacostracaCrayfish, Scuds, and Sowbugs	0	10
Crustacea-Maxillopoda	0	0
InsectaInsects	0	114

Common Name

Match	Common Name
	Arthropods

Pictures Below ↓

This is page 31 of specimens of Arthropoda. Visit the main Arthropoda page for:

The behavior and habitat of Arthropoda.
122 underwater pictures of Arthropoda.

Pictures of 1244 Arthropod Specimens:

Specimen Page:1...303132...126

Female Ephemera varia (Yellow Drake) Mayfly Spinner

View 6 PicturesI found this female spinner ovipositing in a small stream. She came along while I was playing a trout -- every good bug seemed to do that last night! I didn't have my bug net, so I caught the trout in my landing net, released the trout, and caught the mayfly in my landing net. Her wing got a bit messed up from that.

Collected July 7, 2006 from Cayuta Creek in New York
Added to Troutnut.com by Troutnut on July 8, 2006

Hexagenia limbata (Hex) Mayfly Nymph

View 4 Pictures

Collected March 1, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Molanna (Gray Checkered Sedges) Caddisfly Larva

View 4 Pictures

Collected March 1, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Rhithrogena morrisoni (Western March Brown) Mayfly Nymph

View 4 PicturesSize - (excluding tails) - 12 mm
Status at time of photo - preserved, but photographed within days of capture.

W. C. Day, Aquatic Insects of California differentiates morrisoni nymphs by submedian pale dots on tergites (

One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.

Tergite: The top (dorsal) part of a single segment on an insect's abdomen when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.) 8 & 9, which look to be in evidence. This is one of the "super-hatches" on this river that can be prolific March through April.

Entoman

Collected March 3, 2011 from the Lower Yuba River in California
Added to Troutnut.com by Entoman on November 1, 2011

Chironomidae (Midges) Midge Larva

View 5 Pictures

Collected May 10, 2008 from the Chena River in Alaska
Added to Troutnut.com by Troutnut on April 20, 2011

Paraleptophlebia (Blue Quills and Mahogany Duns) Mayfly Nymph

View 4 Pictures

Collected March 9, 2004 from Big Brook in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Ephemera varia (Yellow Drake) Mayfly Nymph

View 4 Pictures

Collected March 29, 2006 from Fall Creek in New York
Added to Troutnut.com by Troutnut on April 6, 2006

Female Hydropsyche (Spotted Sedges) Caddisfly Adult

View 4 Pictures

Collected May 16, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Female Amphinemura (Tiny Winter Blacks) Stonefly Adult

View 5 PicturesA few of these tiny stoneflies were among the only species of aquatic insect adults in the air on this particular afternoon, with most of the action coming from a species of Epeorus mayfly. I somehow forgot to photograph this one on the usual ruler, but I recall it was very, very small, with an abdomen no more than 1mm in girth and the body, not counting the wings, probably just 5-7mm long.

Collected September 6, 2006 from Mystery Creek #23 in New York
Added to Troutnut.com by Troutnut on October 3, 2006

Heptagenia pulla (Golden Dun) Mayfly Nymph

View 5 PicturesI used a microscope to positively identify this nymph as Heptagenia pulla. (Edit six years later: I wish I had explained why I was positive about this. It may have been based on color patterns in an angling text, which are not especially reliable for species ID anymore.)

Collected June 5, 2005 from the Long Lake Branch of the White River in Wisconsin
Added to Troutnut.com by Troutnut on May 25, 2006

Specimen Page:1...303132...126

Jargon Defined:

Abdomen: The rear and usually the longest (ten-segmented in mayflies) portion of an insect's body, to which the tails are attached.

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).

Ovipositing: To lay eggs.

Spinner: There are two winged stages of adult mayflies. They emerge from the water as duns, molt on land (usually) into their fully mature stage, spinners. As spinners, they mate, lay eggs, and die.

One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.

Tergites: The top (dorsal) part of a single segment on an insect's abdomen when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.