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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Furcatergalia » Pannota » Ephemerelloidea » Spiny Crawler Mayflies (Ephemerellidae) » Drunella » Drunella grandis
Photo#271869
Epheremellid - Drunella grandis
Copyright © 2009 Tim Loh

Epheremellid - Drunella grandis
Bow River, Calgary, Alberta, Canada
May 2, 2009
Size: ~15 mm
I'm guessing D. grandis for this one.

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Epheremellid - Drunella grandis Epheremellid - Drunella grandis
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Contributed by Tim Loh on 3 May, 2009 - 2:16pm
Last updated 6 May, 2009 - 11:57pm

Moved
Moved from Drunella.
… Tim Loh, 6 May, 2009 - 11:57pm login or register to post comments

probably D. grandis
This is certainly in the grandis/spinifera group, and 15mm is larger than is typical for spinifera. As I understand the general guidelines for distinguishing between spinifera and the grandis subspecies, the "horns" (tubercles) on the top of the head are somewhat pointed in spinifera (more rounded in grandis) and the last two sets of dorsal abdominal spines are 2X-4X the length of the previous ones (2X or less in grandis).
… Lloyd Gonzales, 6 May, 2009 - 4:02pm login or register to post comments

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