Crab Spider
( Mecaphesa sp. )


2010-0505-01100101-ARA01556-Mecaphesa_sp[1810h08s,F,S,prey]{EXD}-G.jpg

PHOTO COMMENT

IDENTIFICATION
Identification:Mecaphesa sp.
(Ralph Vary Chamberlin, 1900)
Common Name:Crab Spider
Life Stage:(S) subadult

PHYLOGENY

Phylum:Arthropoda
Class:Arachnida
Family:Thomisidae
Genus:Mecaphesa
Taxon Code:ARA01556

LOCATION DETAILS
Location
ISMC Garden - Oakland, Melrose District, 5209 Congress Ave, Oakland
County:Alameda County
ECI Site#:CA01100101

RECOGNITION
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

BIOLOGY

HABITAT

CREDITS
Photographer
Eddie Dunbar

REFERENCES


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