Mayfly Species Ephemerella invaria (Sulphur)

Male Ephemerella invaria (Sulphur) Mayfly Spinner

Collected May 23, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Female Ephemerella invaria (Sulphur) Mayfly Spinner

I caught this one as a dun and he molted into a spinner in my room.

Collected May 27, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

3 Female Spinners

5 Pictures

Collected May 26, 2007 from Penn's Creek in Pennsylvania

Added by Troutnut on June 4, 2007

Female Ephemerella invaria (Sulphur) Mayfly Spinner

Female Ephemerella invaria (Sulphur) Mayfly Spinner

Collected May 28, 2005 from the Namekagon River in Wisconsin

Added by Troutnut on May 24, 2006

Here's the first sulphur dun I found in the 2004 season.

Collected May 18, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

7 Male Duns

7 Pictures

Collected May 26, 2007 from Penn's Creek in Pennsylvania

Added by Troutnut on June 4, 2007

6 Pictures

Collected May 25, 2007 from the Little Juniata River in Pennsylvania

Added by Troutnut on June 4, 2007

Collected May 26, 2005 from the Namekagon River in Wisconsin

Added by Troutnut on May 16, 2006

Collected May 23, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected May 22, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected May 29, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected May 22, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

5 Female Duns

5 Pictures

Collected May 25, 2007 from the Little Juniata River in Pennsylvania

Added by Troutnut on June 4, 2007

6 Pictures

Collected May 28, 2005 from the Teal River in Wisconsin

Added by Troutnut on May 24, 2006

Collected May 23, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected May 23, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected May 28, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

27 Nymphs

8 Pictures

This small Ephemerella invaria nymph was at least a month away from emergence.

Collected April 19, 2006 from the Beaverkill River in New York

Added by Troutnut on April 21, 2006

Collected April 1, 2007 from Mystery Creek #62 in New York

Added by Troutnut on April 3, 2007

Collected March 13, 2005 from Cascadilla Creek in New York

Added by Troutnut on April 5, 2006

5 Pictures

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 31, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

I looked at this small Ephemerella nymph very carefully under a microscope. It as no abdominal tubercles and 1-banded tibiae. I think just a very early instar invaria nymph.

Collected February 7, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

I looked at this nymph closely under a microscope to ascertain some key features I was wondering about in previous photographs of similar specimens. It definitely does have the fan-tail characteristic of the Ephemerella genus. It also has strongly 2-banded tibiae and definite tiny abdominal tubercles.

Collected February 7, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 13, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 31, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected March 10, 2004 from unknown in Wisconsin

Added by Troutnut on January 19, 2006

Collected March 10, 2004 from unknown in Wisconsin

Added by Troutnut on January 19, 2006