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Mayfly Family Isonychiidae (Slate Drakes)

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» Family Isonychiidae (Slate Drakes)
Genus in IsonychiidaeNumber of SpecimensNumber of Pictures
IsonychiaSlate Drakes20105
Common Name
MatchCommon Name
***Slate Drakes
Pictures Below ↓

This is page 2 of streamside pictures of Isonychiidae. Visit the main Isonychiidae page for:

  • The behavior and habitat of Isonychiidae.
  • Studio pictures of 20 Isonychiidae specimens.

5 Streamside Pictures of Isonychiidae Mayflies:

Streamside Photo Page:12
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This is just about the most Isonychia bicolor shucks I've ever seen on the rocks, and appropriately enough they're on the river where Art Flick described them in his Streamside Guide. In this picture: Mayfly Species Isonychia bicolor (Mahogany Dun). From Schoharie Creek in New York.
This is just about the most Isonychia bicolor shucks (
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Here's an underwater view of the pupal shucks of several already-emerged Brachycentrus numerosus caddisflies.
Here's an underwater view of the pupal shucks of several already-emerged Brachycentrus numerosus caddisflies.
Shuck: The shed exoskeleton left over when an insect molts into its next stage or instar. Most often it describes the last nymphal or pupal skin exited during emergence into a winged adult.) I've ever seen on the rocks, and appropriately enough they're on the river where Art Flick described them in his Streamside Guide.

In this picture: Mayfly Species Isonychia bicolor (Mahogany Dun).
StateNew York
LocationSchoharie Creek
Date TakenSep 7, 2006
Date AddedOct 4, 2006
AuthorTroutnut
CameraPENTAX Optio WPi
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Here are the empty nymphal cases of Isonychia bicolor mayflies which hatched in early fall in the Catskills by crawling out onto a rock. In this picture: Mayfly Species Isonychia bicolor (Mahogany Dun). From the Beaverkill River in New York.
Here are the empty nymphal cases of Isonychia bicolor mayflies which hatched in early fall in the Catskills by crawling out onto a rock.

In this picture: Mayfly Species Isonychia bicolor (Mahogany Dun).
StateNew York
LocationBeaverkill River
Date TakenAug 24, 2004
Date AddedJan 17, 2006
AuthorTroutnut
CameraOlympus C740UZ
Streamside Photo Page:12
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