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

Female Siphlonurus alternatus (Gray Drake) Mayfly Spinner Pictures

 I'm tentatively classifying this one as Siphlonurus alternatus, because it seems to fit that species best in the old keys in Needham's Biology of Mayflies, but I'm hesitant because I can't find documentation that southwest Montana or the surrounding area is within the species' range, although they are widely distributed throughout eastern North American and western Canada.

This mayfly was collected from the Gallatin River on July 2nd, 2019 and added to Troutnut.com on July 18th, 2019.

The last abdominal segments of this one were damaged.  Female Siphlonurus alternatus (Gray Drake) Mayfly Spinner from the Gallatin River in Montana
The last abdominal segments of this one were damaged.
The last abdominal segments of this one were damaged.  Female Siphlonurus alternatus (Gray Drake) Mayfly Spinner from the Gallatin River in Montana
The last abdominal segments of this one were damaged.

Start a Discussion of this Spinner:

You must log in at the top of the page to post. If you haven't registered yet, it's this easy:

Username:          Email:

Password:    Confirm Password:

I am at least 13 years old and agree to the rules.
Top 10 Fly Hatches
Top Gift Shop Designs
Top Insect Specimens
Miscellaneous Sites