Sexual-dimorphism-in-flight
Guides
Siphlonurus
primitive minnow mayflies, gray drakes
Siphlonurus is a genus of primitive minnow mayflies in the family Siphlonuridae, comprising more than 40 described species. Species inhabit temporary and intermittent ponds, with nymphal development occurring during spring months and adult emergence in late May to June. Adults are non-feeding and rely on energy reserves accumulated during the aquatic larval stage. The genus is notable among fly fishers for species such as Siphlonurus quebecensis (early brown quill), which is imitated with specialized fly patterns.