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Photo#358934
Salmonfly - Pteronarcys dorsata

Salmonfly - Pteronarcys dorsata
Forks of the Credit River (N43º48'10"W079º59'40"), Wellington, Ontario, Canada
October 2, 2009
Size: 42 mm
Pteronarcys dorsata (Say). Size measurement excludes cerci. This monster was a startling find; it was clinging to the underside of literally the first rock that I pulled out of the Credit. Note the tiny ephemerellid, probably the common Ephemerella subvaria, next to its left metatarsus.

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Salmonfly - Pteronarcys dorsata Salmonfly - Pteronarcys dorsata