Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

The North Fork Couer d'Alene River in Idaho

Stream photos

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Amphizoa Beetle Larva Amphizoa 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).

5 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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Caddisfly Species Parapsyche cardis

Where & when

In 24 records from GBIF, adults of this species have mostly been collected during May (46%), June (38%), and July (13%).

In 23 records from GBIF, this species has been collected at elevations ranging from 1348 to 8481 ft, with an average (median) of 2546 ft.

Species Range

source

Map of specific collection sites

Identification

Species ID from GBIFthe Global Biodiversity Information Facility

Source: Description of the female of Parapsyche cardis Ross (Hydropsychidae: Arctopsychinae) and a revised key to the genera of Hydropsychidae (Trichoptera: Annulipalpia) of the southeastern United States, using wing characters

Diagnosis. Hind wing crossveins sc-r and r-rs are not coincident in the insertion on R, their insertions being separated by at least the length of crossvein r-rs. Paired, sclerotized, anteroventrad-directed projections are visible inside segment IX.

Physical description

Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.

Description from GBIFthe Global Biodiversity Information Facility

Source: Description of the female of Parapsyche cardis Ross (Hydropsychidae: Arctopsychinae) and a revised key to the genera of Hydropsychidae (Trichoptera: Annulipalpia) of the southeastern United States, using wing characters

Description. Wings (Fig. 28): fwl = 10.6 – 14.4 mm; = 12.1; ? = 1.18 (N = 32). Wings sub-hyaline, infuscate with light mottling, shape typical for subfamily. Female genitalia (Figs. 21 – 23): Segment IX (IX) in lateral view (Fig. 21) relatively short in its longitudinal dimension throughout its height; anterior margin sinuous; dorsum about 1 / 5 th as long as height of segment IX, produced as prominent angle dorsally; in caudal and internal views (Figs. 22, 23), dorsum with vertex convex; sides of segment IX with pronounced lateral bulge in basal 1 / 3 rd; with paired, sigmoid, sclerotized rods inserting inside venter of segment IX. Prominent articulation ventrolaterally between segment IX and segment X (X), with segments IX and X strongly sclerotized. Pair of circular setal patches (sp) mediolaterally on posterior horizontal face of dorsum of segment IX, setae in 3 rows (Fig. 27).

Start a Discussion of Parapsyche cardis

References

Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.