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.
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: Eggs Of Western Nearctic Acroneuriinae (Plecoptera: Perlidae)
Egg. Outline oval with short, narrow collar (Fig. 9). Egg length ca. 500 µm, equatorial width ca. 400 µm, collar length ca. 20 µm width ca. 50 µm Chorionic surface coarsely punctate with shallow pits over middle half of egg (Figs 10, 12.); punctate zone ca. 260 µm wide; area around collar and a narrow opercular ring around lid lack pits; some pits on lid form obscure follicle cell impression walls. Micropylar row located on lid (Fig. 11); orifices raised, canals not clearly visible on surface.