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 Isoperla burksi (Yellow Sallies)
Species Range
Identification
Species ID from GBIFthe Global Biodiversity Information Facility
Source: Taxonomic Notes On The Eggs Of Eastern Nearctic Isoperla (Plecoptera: Perlodidae: Isoperlinae)
Diagnosis. Szczytko & Kondratieff (2015) placed this species in the Isoperla burksi group with Isoperla cotta Ricker, 1952 and Isoperla orata Frison, 1942. Egg characteristics uniting these species include a concave cross-section, well-developed collar, distinct ridges off-setting the cell impressions, and lack of an eclosion line (Szczytko & Kondratieff 2015). Eggs of Isoperla burksi from Indiana and Kentucky, however, possess a distinct eclosion line (Figs. 4 - 6) that easily distinguishes this species from Isoperla cotta (Szczytko & Kondratieff 2015, figs. 10.14, 10.18) and Isoperla orata (Szczytko & Kondratieff 2015, figs. 37.9, 37.12). Each of the other three characteristics listed above are exhibited by Isoperla burksi.
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.
Description from GBIFthe Global Biodiversity Information Facility
Source: Taxonomic Notes On The Eggs Of Eastern Nearctic Isoperla (Plecoptera: Perlodidae: Isoperlinae)
(Figs. 1 - 6) http: // lsid. speciesfile. org / urn: lsid: Plecoptera. speciesfile. org: TaxonName: 468714Source: Taxonomic Notes On The Eggs Of Eastern Nearctic Isoperla (Plecoptera: Perlodidae: Isoperlinae)
Egg. General shape oblong, cross-section concave (Figs. 1 - 2), anterior and posterior poles broadly-rounded (Figs. 2 - 4). Color pale brown. Collar well-developed, with irregular longitudinal ridges, slightly flared apically (Fig. 3). Follicle cell impressions near collar ranging from elongate to hexagonal (Figs. 1, 3). Chorion covered mostly with irregular-shaped pentagonal or hexagonal follicle cell impressions with thickened elevated ridges (Figs. 4 - 6); floors with numerous shallow pits (Fig. 5 - 6). Eclosion line present (Figs. 4 - 6). Micropyles located along ridges near eclosion line in anterior ¼ (Figs. 5 - 6).
Start a Discussion of Isoperla burksi
Stonefly Species Isoperla burksi (Yellow Sallies)
Species Range
Common Names
Resources
- NatureServe
- Integrated Taxonomic Information System
- Global Biodiversity Information Facility
- Described by Frison, T.H. (1942) Studies of North American Plecoptera, With Special Reference to the Fauna of Illinois. Illinois Natural History Survey Bulletin 22, 235–355.