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Possible Isoperla secies - Acroneuria

Possible Isoperla secies - Acroneuria
Mount Arabia, Georgia, USA
February 26, 2016
Size: 3 cm
I followed the Guide to the Stoneflies (Plecoptera) of Florida to the genus level but would appreciate if anyone could help me pinpoint the species. The features that got me this far are: highly branched gills on sides and venter of thoracic segments, no gills on 1st or 2nd abdominal segments; cerci at least as long as abdomen and contrasting pigment pattern on head and thorax; submental gills absent; ocellar triangle covered with dark area (but without a light patch in the middle as is typical of the genus).

I found this specimen under gravel in a fast moving clear stream.

Moved from ID Request.

Highly branched gills on the sides of the thoracic segments is characteristic of the Perlidae. None of the Perlodidae have branched thoracic gills. A few genera out here on the West Coast have simple gills, however.

Thanks! I'll have to go see w
Thanks! I'll have to go see where I went wrong.

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