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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.

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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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Stonefly Species Salmoperla sylvanica (Bighead Springflies)

Species Range

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.

Source: Description Of The Male Terminalia Of Two Western Nearctic Perlodinae (Pictetiella Expansa (Banks) And Salmoperla Sylvanica Baumann & Lauck)

Description: Male. For a habitus description refer to Baumann and Lauck (1987). Head and pronotum shown in (Fig. 12). Ninth tergum with pair of lateral humps (LH), apices covered in sensilla basiconica, lateral margins covered in long fine hairs (Fig. 13). Tenth tergum deeply cleft, membranous with a large basal anchor (BA) which extends to base of the epiproct cowl (Fig. 14). Epiproct cowl (EC) membranous with sparse setae (Fig. 13) and flanked by two rectangular paragenital plates (PP) at base (Fig. 14). Hemitergal lobes (HL) rounded produced inward, sclerotized and flattened at apices bearing sensilla basiconica anteriorly and fine hairs posteriorly (Fig. 14). Epiproct short, boxlike in dorsal aspect, basal portion slightly narrowed, covered in backward directed scale-like setae, setae absent on apex (Figs. 15, 16). Lateral stylets short, broad and darkly sclerotized terminating in outward directed hooks, present laterally at epiproct base (Fig. 16). Aedeagus with pair of large posterolateral lobes at base (Fig. 17). Basal portion of aedeagus covered with uniformly spaced spinulae (Fig. 17). Apex of aedeagus bulbous, glabrous (Fig. 17).

Start a Discussion of Salmoperla sylvanica

Stonefly Species Salmoperla sylvanica (Bighead Springflies)

Species Range
Common Name
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