Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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: The Winter Stoneflies (Plecoptera: Capniidae) Of Mississippi
Male tergal process. Tergum 8 process rests on a large oval ridge and bears a thin, compressed dorsal crest. Anterior face of process bent abruptly near apex, and anterodorsal surface devoid of scale-like tubercles (Figs. 28 - 29).
Female subgenital plate. Abdominal sterna 7 and 8 completely separated by membrane. Posterior margin of subgenital plate usually without projecting mesal lobe; anterior margin of sternum 8 bears a pair of small basolateral lobes (Figs. 30, 62). Source: New Records Of Winter Stoneflies (Plecoptera: Capniidae) In Mississippi