Hexagenia (Hex ) | larva (nymph)
![](http://www.troutnut.com/im_regspec/picture_2246_large.jpg) Copyright © Jason Neuswanger |
| subimago (dun) - male
![](http://bugguide.net/images/raw/AH4HTHIHDH8HBHMH4Z8HTHSLPZGHRRXLWZ4L9Z4LHR7LGZQL4ZQL8Z0L6Z8HPZXHBH0L4ZRL4Z0L.jpg) Copyright © 2005 Lynette Schimming |
subimago (dun) - female
![](http://bugguide.net/images/raw/60Q0E0OQ40OQX0JQFKJQG01RFKBRM0L0QQYRU0ORMQZ0I01RMQS0G0FQHQCQYKAR409RJKFQHQNRYK.jpg) Copyright © 2009 Lynn Avis |
imago (spinner) - male
![](http://bugguide.net/images/cache/108QD0GQRSRKTKQKOKXKVKMKBK4KUK4QEKZK1KXKJ0NQTKBQHSXKAKGKOK8KBKAQDK9QY09QDKWQ104Q6KZK2K5Q2K.jpg) Copyright © 2008 Lynette Schimming |
imago (spinner) - female
![](http://bugguide.net/images/cache/4HDHMHTHEHEZXL9ZHLGZLL4ZSL1HXH5ZILLRMLNZILLRUHRR5LBZ6HFHMLBZ8LEZSLEZGHPZ8H5ZSLAZPHLR5HBH0L.jpg) Copyright © 2010 Eric Matthews |
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Hexagenia | Head w/conicical rounded, or truncate frontal process; mandibular tusks upturned when viewed from side, and w/hairs along entire length; gills on ab. seg. 1 very small, otherwise w/large feather-like gills. | . |
Hexagenia bilineata | | |
Hexagenia limbata (Big Yellow May; Giant Mayfly; Great Lead-winged Drake; Burrowing Mayfly; Giant Yellow Mayfly; Fishfly; Giant Michigan Mayfly; Great Olive-winged Drake; Great Pale Yellow Drake; Great Sulphur Drake; Hex; Michigan Caddis; Sandfly; Michigan Spinner. ) | | |
| Rounded frontal process dome-shaped; double gills on 1st segment; tusks less than 1 .5x head length; tarsal claws. | Body dark brown tergites w/lighter sternites; wings smokey gray w/olive cast, darkly shaded on margin; length 17-40 mm.; 2 tails; emerges May 20 - early Aug. |