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 Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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.

Corydalus (Dobsonfly) Hellgrammite Larva Pictures

Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Large hellgrammite (dobsonfly larva). This nearly two inch long larva from the genus Corydalus is a fearsome predator

Dorsal view of a Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Lateral view of a Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Ruler view of a Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania The smallest ruler marks are 1 mm.
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Large hellgrammite (dobsonfly larva). This nearly two inch long larva from the genus Corydalus is a fearsome predator.

Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Ventral view of a Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Artistic view of a Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
This hellgrammite seemed to think it could escape by moving rocks around, so it was picking up surprisingly large pieces of gravel and throwing them back over the top of its head.  It was really cool to watch and I wish I had got it on video, but it gave up too quickly.

Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Artistic view of a Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania
Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania

This hellgrammite was collected from Paradise Creek in Pennsylvania on May 29th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.

Discussions of this Larva

Hellgrammite Video
1 replies
Posted by DOS on Mar 11, 2009
Last reply on Mar 11, 2009 by DOS
Here is some quick video footage of a Hellgrammite I collected from a Western New York trout stream in February and filmed in my aquarium several weeks later.

http://www.vimeo.com/3590982

Start a Discussion of Larva

Corydalus (Dobsonfly) Hellgrammite Larva Pictures

Collection details
Location: Paradise Creek, Pennsylvania
Date: May 29th, 2007
Added to site: June 4th, 2007
Author: Troutnut
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy