Header image
Enter a name
Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Dorsal view of a Grammotaulius betteni (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This is a striking caddis larva with an interesting color pattern on the head. Here are some characteristics I was able to see under the microscope, but could not easily expose for a picture:
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.
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
Konchu's profile picture
Site Editor
Indiana

Posts: 498
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
Konchu's profile picture
Site Editor
Indiana

Posts: 498
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
Konchu's profile picture
Site Editor
Indiana

Posts: 498
Konchu on Aug 9, 2007August 9th, 2007, 10:30 am EDT
Good leptohyphid habitat.
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
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
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
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
Konchu's profile picture
Site Editor
Indiana

Posts: 498
Konchu on Aug 10, 2007August 10th, 2007, 5:01 am EDT
The tails on this beast are too long for Tricorythodes...

Quick Reply

Related Discussions

Topic
Replies
Last Reply
1
Apr 16, 2015
by Wbranch
4
Dec 17, 2008
by Xavier_Carp
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy