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 Procloeon ozburni (Tiny Sulphur Duns)
Where & when
In 1 records from GBIF, adults of this species have been collected during July (100%).
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: 4.5-5 mm
Abdominal tergites 2-6 of male imago hyaline white, the posterior margins narrowly chocolate-brown.
Head and antennae blackish; tip of antennae white. Thorax unicolorous deep blackish dorsally, the pleura and sternum slightly more brownish; anterior edge of mesosternum tipped with pale ochreous. Legs whitish; traces of a ruddy median band on the femora. Wings hyaline. Hind wing long and narrow, two longitudinal veins (see fig. 165). Abdominal tergites 2-6 hyaline white; traces of an interrupted brown geminate mid-dorsal line; a narrow band of chocolate brown on the posterior margin of each, this band barely attaining the spiracular area. Tergites 7-10 chocolate brown, sternites alabaster white. Sternites 2-6 hyaline white, with very faint traces of brown posterior margins, most evident on 5 and 6. A blackish line marks the spiracular area. Tails white.
The dark thorax and the deeper brown of the posterior abdominal tergites distinguish this species from C. bellum (now a synonym of Procloeon bellum). The darker color and more prominent banding of the abdomen separate it from fragile (now a synonym of Procloeon fragile).
Nymph
The nymph of specimens is much like that of C. bellum (now a synonym of Procloeon bellum), but has a broad band of brown on sternite 9, also lateral markings on some of the other apical sternites, and the sternites margined posteriorly with brown.
Start a Discussion of Procloeon ozburni
References
- Needham, James G., Jay R. Traver, and Yin-Chi Hsu. 1935. The Biology of Mayflies. Comstock Publishing Company, Inc.
Mayfly Species Procloeon ozburni (Tiny Sulphur Duns)
Species Range
Common Name
Resources
- NatureServe
- Integrated Taxonomic Information System
- Global Biodiversity Information Facility
- Described by McDunnough (1924)