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Drunella grandis? - Drunella spinifera

Drunella grandis? - Drunella spinifera
Inchelium, Ferry County, Washington, USA
July 26, 2011
Size: 11 mm not including cerci

Moved from Mayflies.

Drunella spinifera
Hi Joseph-

I believe this to be Drunella spinifera, because the last two pairs of abdominal tubercles are thin, sharp, and more than twice as long as the tubercles on the other abdominal segments.

Were this D. grandis, the last two pair of abdominal segment tubercles would be more stout, and their length would be similar to the length of the tubercles on the other abdominal segments.

Please see the following examples of D. spinifera vs. D. grandis:

Thanks Roger.

Moved from ID Request.

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