Troutnut.com Fly Fishing for Trout Home
User Password
or register.
Scientific name search:

Mayfly Family Isonychiidae (Slate Drakes)

Taxonomic Navigation -?-
» Family Isonychiidae (Slate Drakes)
Genus in IsonychiidaeNumber of SpecimensNumber of Pictures
IsonychiaSlate Drakes00
Common Name
MatchCommon Name
***Slate Drakes


Pictures Below ↓

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

  • The behavior and habitat of Isonychiidae.

Pictures of 20 Mayfly Specimens in the Family Isonychiidae:

Specimen Page:123
Isonychia bicolor (Mahogany Dun) Mayfly NymphIsonychia bicolor (Mahogany Dun) Mayfly Nymph View 5 Pictures
Collected January 13, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Female Isonychia bicolor (Mahogany Dun) Mayfly SpinnerFemale Isonychia bicolor (Mahogany Dun) Mayfly Spinner View 10 PicturesI collected this female together with a male.
Collected August 9, 2006 from the West Branch of Owego Creek in New York
Added to Troutnut.com by Troutnut on August 11, 2006
Female Isonychia bicolor (Mahogany Dun) Mayfly DunFemale Isonychia bicolor (Mahogany Dun) Mayfly Dun View 6 PicturesI thought this dun was worth photographing, even though she's in pretty bad shape, because she shows something I haven't seen in Isonychia elsewhere. The bright stripe down the back which is normally present only in the nymph carried over to the dun in this one.
Collected May 26, 2007 from Penn's Creek in Pennsylvania
Added to Troutnut.com by Troutnut on June 4, 2007
Isonychia bicolor (Mahogany Dun) Mayfly NymphIsonychia bicolor (Mahogany Dun) Mayfly Nymph View 4 Pictures
Collected February 7, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Isonychia bicolor (Mahogany Dun) Mayfly NymphIsonychia bicolor (Mahogany Dun) Mayfly Nymph View 5 Pictures
Collected April 19, 2006 from the Beaverkill River in New York
Added to Troutnut.com by Troutnut on April 21, 2006
Isonychia (Slate Drakes) Mayfly NymphIsonychia (Slate Drakes) Mayfly Nymph View 3 PicturesThis smaller Isonychia nymph was caught with a bunch of bicolor specimens, but it does not have the fluffy spine structure at the base of its gills. This might mean it's Isonychia sayi, or it might just be a bicolor nymph too young to have developed those structures.
Collected January 13, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Isonychia bicolor (Mahogany Dun) Mayfly NymphIsonychia bicolor (Mahogany Dun) Mayfly Nymph View 3 Pictures
Collected March 13, 2005 from Cascadilla Creek in New York
Added to Troutnut.com by Troutnut on April 5, 2006
Isonychia bicolor (Mahogany Dun) Mayfly NymphIsonychia bicolor (Mahogany Dun) Mayfly Nymph View 4 Pictures
Collected February 7, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Isonychia bicolor (Mahogany Dun) Mayfly NymphIsonychia bicolor (Mahogany Dun) Mayfly Nymph View 2 Pictures
Collected January 19, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Isonychia bicolor (Mahogany Dun) Mayfly NymphIsonychia bicolor (Mahogany Dun) Mayfly Nymph View 2 PicturesThese three Isonychia nymphs show the variety within the species from a single day at a single collection site.
Collected January 14, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Specimen Page:123
Top 10 Fly Hatches
BaetisBaetidaeEphemerellidaeHexagenia limbataChironomidaeHeptageniidaeEphemerella subvariaEphemerellaIsonychiaHydropsychidae
Top Gift Shop Designs
I outfish my daddy!Electric blue Hendrickson dun.I love buggers. Big, green, wooly ones.I outfish my husband!Be the trout.
Eat mayflies.
Top Insect Specimens
Baetisca obesa Mayfly NymphCorydalus Hellgrammite LarvaRhyacophila fuscula Caddisfly LarvaPteronarcys biloba Stonefly NymphHydropsyche aenigma Caddisfly Adult
Miscellaneous Sites
Dalton Highway (Haul Road) Corridor Map