Flavs (Small Green Drakes, or Flavilineas)
Flavs (Small Green Drakes, or Flavilineas)
Family: Ephemerellidae
Genus: Drunella
Life Cycle: incomplete
Three Life Stages: egg, nymph, adult cycle which includes 2 phases: dun and spinner
Emergence: June-August
Crawler Mayfly Group
Nymphs
Body Description
Antennae: 2
Wings: pads
Legs: 6, stout front legs have teeth on front edge
Abdomen: no long spines
Eyes: large
Tails: 3
Body Colors: browns with olive tones
Mobility: become more active before emergence
Size: 7-9mm
Hook Size: 12-16
Found among rocks in faster current flows. They emerge from slower water by faster flows and from runs with slow to medium currents.
Dun
Body Description
Antennae: 2
Wings: 2 sets, hind wings have pointed edges, dark grey
Legs: 6
Eyes: large
Tails: 3
Body Colors: light olive with yellow tones
Mobility: must wait on the water floating or drifting after emergence for their wings to unfold before flying
Size: 7-9mm
Hook Size: 14-16
Spinner
Body Description
Antennae: 2
Wings: 2 sets, hind wings have pointed edges
Legs: 6
Eyes: large
Tails: 3
Body Colors: dark olive to olive brown
Size: 7-9mm
Hook Size: 14-16
One day after emergence they are sexually mature. Male & females meet in swarms; after mating males fall spent on the water or ground, females hover close to the water, deposit their eggs then fall spent.