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.
Mayfly Species Baetisca lacustris (Armored Mayflies)
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.
Male Spinner
Wing length: 8 mm
Abdominal tergites of male imago brown, sternites pale yellowish white; venation wholly pale.
Head and thorax brown; thoracic sternum pale brown. Legs pale yellowish white. Wings hyaline, venation wholly pale. Abdominal tergites brown; sternites pale yellowish white, contrasting strongly with the dark upper surface. Forceps yellowish white. Tails whitish, not darker at joinings.
Nymph
The nymph has lateral but no dorsal spines on the mesonotal shield; the genae are not produced into spines; the frontal projections are small and rounded. The lateral mesonotal spines are very long and sharp. This species is distinguished from others in the genus by the wholly pale venation and the striking contrast in color between the dorsal and ventral surfaces of the abdomen.
Start a Discussion of Baetisca lacustris
References
- Needham, James G., Jay R. Traver, and Yin-Chi Hsu. 1935. The Biology of Mayflies. Comstock Publishing Company, Inc.
Mayfly Species Baetisca lacustris (Armored Mayflies)
Species Range
Resources
- NatureServe
- Integrated Taxonomic Information System
- Global Biodiversity Information Facility
- Described by McDunnough (1932)