Upper Delaware river insects, Pteronarcys dorsata, Giant Black Stonefly, insect identification fly fishing.

Pteronarcys dorsata
Order Plecoptera
Family Pteronarcidae
Genus Pteronarcys
Species dorsata

Aquatic insect, Pteronarcys dorsata, Giant Black Stone, insect identification, Delaware, river, fly fishing, identification, mayflies, caddisflies, stoneflies.
Pteronarcys dorsata

Pronounced - tear on ahr cis - door sah tah

Common Name - Giant Black Stone

Size
Hook - 6, 8, 10
Millimeter - 40 to 50

Nymph
Body Color - Dorsal - dark brown to dark redish brown.
Body Color - Ventral - yellow with an orangeish olive tinge.

Adult
Body Color - Dorsal - dark brown.
Body Color - Ventral - yellow with an orangeish olive tinge.
Wing Color - Medium Dun

   Pteronarcys is the largest stonefly in North America. P. dorsata nymphs are detritivores and herbivores with a diet consisting mainly of deteriorating leaves, and plant debris.

   Hatches begin mid March to early April depending on the weather conditions. Due to the fact that P. dorsata has a three year growth cycle nymphs are present in a variety of sizes at any given time. Fishing fast riffles with a nymph imitation in an assortment of sizes can produce fish threw out the season.

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