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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington
This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Xavier_Carp has attached this picture to aid in identification. The message is below.
Xavier_Carp
Posts: 13
Xavier_Carp on Aug 7, 2007August 7th, 2007, 11:25 am EDT
Hi, I know it is a mayfly, but don't know the species, hope you can help me out, it was photographed down here in Mexico.

Konchu
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Indiana

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Konchu on Aug 7, 2007August 7th, 2007, 1:54 pm EDT
Looks similar to the genus Tricorythodes (what people call Tricos) or some other member of the family Leptohyphidae. The dark color, three tails and shape & coloration of wings all help me to guess that it is Tricorythodes.

How big was it? What part of Mexico were you in when you saw it?
Xavier_Carp
Posts: 13
Xavier_Carp on Aug 8, 2007August 8th, 2007, 3:25 am EDT
It is small maybe 1.4 cm I saw it in the central part of mexico, the place is about 2000 mt above the sea level, it was a beautiful shinny black color
Konchu
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Konchu on Aug 8, 2007August 8th, 2007, 4:55 pm EDT
Several Tricorythodes species are known from central Mexico.
http://www.entm.purdue.edu/entomology/research/mayfly/species.html

Did you see the river or stream nearby? If so, please describe it. This might help.
Xavier_Carp
Posts: 13
Xavier_Carp on Aug 9, 2007August 9th, 2007, 9:41 am EDT
Konchu, I was fishing on this small creek, the area where I caught it is where the water is most still avobe a small dam, the creek is only 6ft wide and not very deep, the deepest pools are about 4ft and average depth is 2ft bottom is mostly grtavel with some areas covered with a thin layer of silt, hope this help

Konchu
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Konchu on Aug 9, 2007August 9th, 2007, 10:30 am EDT
Good leptohyphid habitat.
Taxon
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Taxon on Aug 9, 2007August 9th, 2007, 11:55 am EDT
Xavier_Carp-

When you say Central Mexico, are you referring to the country or the state of México? This information would allow me to significantly narrow down the identification possibilities.

Here is a list of the Mexican states:

    SW Southwest Region
  • BN Baja California
  • BS Baja California Sur
  • CA Coahuila
  • CH Chihuahua
  • DU Durango (all but southern tip)
  • NL Nuevo León
  • SI Sinaloa (all but southern third)
  • SL San Luis Potosí (northern tip)
  • SO Sonora
  • TM Tamaulipas (all but southern third)
  • ZA Zacatecas (all but southern tip)
  • FS Far South Region
  • AG Aguascalientes
  • CL Colima
  • CM Campeche
  • CP Chiapas
  • DF Distrito Federal
  • DU Durango (southern tip)
  • GJ Guanajuato
  • GR Guerrero
  • HI Hidalgo
  • JA Jalisco
  • MC Michoacán
  • MR Morelos
  • MX México
  • NA Nayarit
  • OA Oaxaca
  • PU Puebla
  • QE Querétaro
  • QR Quintana Roo
  • SI Sinaloa (southern third)
  • SL San Luis Potosí (all but northern tip)
  • TB Tabasco
  • TL Tlaxcala
  • TM Tamaulipas (southern third)
  • VE Veracruz
  • YU Yucatán
  • ZA Zacatecas (southern tip)
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Xavier_Carp
Posts: 13
Xavier_Carp on Aug 9, 2007August 9th, 2007, 12:46 pm EDT
Taxon, it was pictured in Puebla
THX
Taxon
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Taxon on Aug 9, 2007August 9th, 2007, 1:55 pm EDT
Hmmmm. Puebla, doesn’t seem have any leptohyphids recorded, at least according to a list compiled from Dr. Pat Randolph’s PhD dissertation. So, I looked at the surrounding states, and found that Oaxaca, immediately south of Puebla, has records of the following leptohyphids:

    Leptohyphes alleni
    Leptohyphes brunneus
    Leptohyphes castaneus
    Leptohyphes zalope
    Tricorythodes notatus
    Vacupernius packeri


It is likely one of these. Perhaps Konchu will be able to narrow it further.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Konchu
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Indiana

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Konchu on Aug 10, 2007August 10th, 2007, 5:01 am EDT
The tails on this beast are too long for Tricorythodes...

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