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Genus Misumessus

Unidentified Spider - Misumessus Fiddler crab - subadult male - Misumessus oblongus - male crab spider - Misumessus oblongus Spider - Misumessus oblongus Misumessus oblongus Green spider - Misumessus oblongus Purple flower, yellow spider - Misumessus oblongus Misumessus oblongus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynes )
Family Thomisidae (Crab Spiders)
Genus Misumessus
Synonyms and other taxonomic changes
Lehtinen, P. T. & Y. M. Marusik, 2008. A redefinition of Misumenops F. O. Pickard-Cambridge, 1900 (Araneae, Thomisidae) and review of the New World species. Bull. Br. arachnol. Soc. 14: 173-198.
Numbers
1 species in the USA & Canada.
Identification
Misumessus are somewhat common in my area and I'm starting to get a gestalt for them. I see similarities between Misumessus and Misumena in large females. Here are some of my Misumessus clues:

The Misumessus in my area have a gorgeous green-bordered tiling pattern of guanocytes on the abdomen that for me, at least in person, is sufficient to make the ID. (After examining the above thumbs, I'm not so sure the color pattern is diagnostic. This one is shaped like M. vatia but colored the way I expect M. oblongus to be colored.)
~ Joe Lapp, 6 March, 2012

Some closeups of facial images to aid in identification:

Misumessus:

ALEs larger than AMEs.

Misumena:
All four anterior (front) eyes are about the same size. When viewed from the front, and a little above, it seems all eight eyes are visible and form a crescent shape. The lateral eyes are on tubercles, but the posterior laterals are visible. See



Misumenoides:
All four anterior (front) eyes are about the same size. When viewed from the front, and a little above, only six eyes are visible. The posterior laterals are facing sideways and are on the ends of a long horizontal transverse ridge across the face. Eric says "Misumena has essentially no black markings (while Misumenoides may have some), which is how you can tell them apart in the field most easily." See



Mecaphesa:
The anterior lateral eyes are a little larger than the anterior median eyes. When viewed from the front, and a little above, only six eyes are visible. The posterior laterals are facing sideways and backwards on tubercles that include the anterior laterals. Mecaphesa is also often (always?) hairy. See



Comments, corrections, and suggestions most welcome. Please add them to discussion thread here.

Images by Tom Adams, Troy Bartlett, Derrick Ditchburn, Tony DiTerlizzi, Bill DuPree, Vincent J Hickey, Richard Leung, Paul F Wagner, Paul McNelis, Bill Claff, and Chris Wirth
Remarks
Previous spiders in this genus have since been moved to Synema.