Mayfly Genus Isonychia (Slate Drakes)

Mayflies Caddisflies Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Isonychiidae (Slate Drakes)

» Genus Isonychia (Slate Drakes)

Species in Isonychia
Isonychia bicolorMahogany Dun	19	102
Isonychia campestrisSlate Drake	0	0
Isonychia siccaSlate Drake	0	0
Isonychia velmaSlate Drake	0	0

12 species

(Isonychia arida, Isonychia berneri, Isonychia diversa, Isonychia georgiae, Isonychia hoffmani, Isonychia intermedia, Isonychia obscura, Isonychia rufa, Isonychia sayi, Isonychia serrata, Isonychia similis, Isonychia tusculanensis)

aren't included.

Common Names

Match	Common Name
	Slate Drakes
	Leadwings
	Great Western Leadwings
	Leadwing Coachmen
	Great Lead-Winged Coachmen

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

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

5 Streamside Pictures of Isonychia Mayflies:

Streamside Photo Page:12

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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.

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

View Full Size and Comment (1.7X larger)

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

Jargon Defined:

View Full Size

Here's an underwater view of the pupal shucks of several already-emerged Brachycentrus numerosus caddisflies.

Shucks: 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.

Useful References: