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Photo#17638
Marsh Fly - Sepedon gracilicornis

Marsh Fly - Sepedon gracilicornis
Harvard, Worcester County, Massachusetts, USA
May 16, 2005

Moved
Moved from Sepedon.
Thanks Bill. It sounds like there's a few species that can look almost identical except the antennae are different.

Sepedon gracilicornis Orth
The long, evenly expanded second antennal segment is diagnostic for S. gracilicornis. If they are a bit longer but slightly constricted at about 1/4 their length from the base, they are S. tenuicornis. If they are laterally flattened, higher than wide (=thin in cross section), then in most of eastern and northeastern North America they are S. fuscipennis.

Dictyacium?
I have found only one genus for which such elongated antennae are specifically mentioned (so it does not mean there could not be other genera) and that is Dictyacium: two species from northern and central USA and southern Canada mainly easy of the Rockies.

Paul

http://www.diptera.info

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