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Archive for July 4, 2013


This is a Stonefly!

7-3-13 stonefly adult 036

Mystery Photo Correction – This Photo is of a Fishfly

7-2-13 stonefly adult 058I owe my readers an apology. July 3rd’s post image was of a fishfly, not a stonefly. Adult stoneflies, fishflies and dobsonflies all have aquatic larval stages and the long-winged adults resemble each other quite closely. Mouthparts and antennae are helpful in distinguishing between the three. Fishflies (pictured) have small mandibles and feathery antennae, whereas dobsonflies and stoneflies have larger mandibles (especially the pincers of male dobsonflies) and their antennae are thread-like, not feathery. Fishflies and dobsonflies are in the same family (Coryalidae). Fishflies spend several years in the water as larvae before emerging as adult fishflies (that live up to a week). (Thank you to the observant readers who caught this mistake!)