Great Brown Spinners
Like most common names, "Great Brown Spinner" can refer to more than one taxon. For more detail click through to the scientific names.
Mayfly Species Litobrancha recurvata
These are sometimes called Great Brown Spinners.
This is the largest species of mayfly in North America. Sometimes it appears together with the Hexagenia limbata hatch or the Ephemera guttulata hatch, but in other places it creates excellent action on its own.
Mayfly Species Timpanoga hecuba
These are very rarely called Great Brown Spinners.
Timpanoga hecuba is not abundant enough, and its emergence not concentrated enough, to provide great hatches, but where it is locally abundant it creates fishable action because of its large size. It is one of the largest species in the Ephemerellidae family, being almost the size of Drunella grandis, the Western Green Drake.
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