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.
Stonefly Species Haploperla chilnualna (Sallflies)
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 Adult
Length from head to tip of wings 6.5 mm. Color yellow, without dark markings. Very similar to the widespread Haploperla brevis, but the anal venation of the hindwing is not quite so reduced : vein A1 usually terminates slightly distad of the position of the proximal intercubital crossvein, instead of proximad as in Haploperla brevis. However, the anal area apparently does not fold, and vein A1 is much shorter than in Rasvena or (still more) Chloroperla sensu stricto. Vein A2 of the hindwing present but short. Vein A2 of the forewing undivided.
The supra-anal process is erect and has a short hook directed forward (Fig. 151). The hooked supra-anal process best distinguishes this species from Haploperla brevis.
Start a Discussion of Haploperla chilnualna
References
Stonefly Species Haploperla chilnualna (Sallflies)
Species Range
Common Names
Resources
- NatureServe
- Integrated Taxonomic Information System
- Global Biodiversity Information Facility
- Described by Ricker, W.E. (1952) Systematic Studies in Plecoptera. Indiana University Publications Science Series 18, 1–200.