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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.
A species of the jejuna-undulata group, having no basal lateral spines on penes; tips of penes broad, distinctly outcurved.
Head and thorax dark brown; several yellow spots on pleura. Fore legs brownish; apex of tibia darker. Middle and hind legs pale; dark streaks on femora. Wings hyaline; venation brown. Stigmatic area tinged with smoky; cross veins in this region mostly simple. Abdominal tergites dark brown; lateral margins very narrowly pale. Sternites very pale. Forceps dark brown, tails paler brown. Apices of penes broad, distinctly outcurved; no basal lateral spine, nor small spines near apex (see fig. 102).
Allied to Rhithrogena jejuna and Rhithrogena impersonata. Tips of penes outcurved as in R. jejuna, but not narrowed as in that species; no small apical spines such as occur in R. impersonata.