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> > What genus is this Heptageniid?

The Specimen

Rhithrogena Mayfly SpinnerRhithrogena  Mayfly Spinner View 9 PicturesI'm very tentatively (see the connected forum thread) sticking this mayfly in Rhithrogena for now.
Collected June 7, 2007 from the West Branch of the Delaware River in New York
Added to by on June 8, 2007

The Discussion

TroutnutJune 8th, 2007, 3:10 pm
Bellevue, WA

Posts: 2553
I didn't even recognize it as a member of that family at first, but it seems to be the only option. The hind tarsus is distinctly 5-segmented, which I verified under the microscope because you can't see it very well on my photos. However, I because it's a female spinner I can't key it to genus using the Merrit & Cummins keys. Does anyone just recognize it?

I found it drifting, nearly dead on the surface at about 5pm on a hot afternoon.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
KonchuJune 9th, 2007, 6:07 am
Site Editor

Posts: 496
Ignoring all other details, the body shape & color and leg markings resemble some Epeorus and Rhithrogena. Possibly Rhithrogena is the closest. I collected some about like this with male spinners a few weeks ago in Tennessee.
TroutnutJune 9th, 2007, 8:16 am
Bellevue, WA

Posts: 2553
I was considering Rhithrogena too because it has a few of those anastomosed crossveins. They just aren't as prominent as I've seen in most illustrations, which gave me cause for doubt. I'll tentatively stick it in there for now.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
TanaFebruary 1st, 2009, 2:15 am
Madrid España

Posts: 1
Hola, Creo que no es posible determinar un insecto de estas caracteristicas en esste estado, ha tantos tipos de Rhithrogena que no podria saber si realmente es alguna, en estados adultos yo en España recomiendo imitar color y tamaño, a mi me parece que se puede sustituir por la March Bronw, recomiendo leer esto:

Un saludo a todos Tana
TaxonFebruary 1st, 2009, 11:24 am
Site Editor
Plano, TX

Posts: 1301
Although the translation may be less than perfect,
this is (more or less) what Tana is saying
when translated to English:

Hello, I think it is not possible to identify an insect of its kind in this state,
has many different types of Rhithrogena could not really tell if any,
adult I recommend imitate Spain in color and size,
I find that you can replaced by the March Brown,
I read this:


Roger Rohrbeck

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