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Photo#42866
Oak Leaf Aphids - Myzocallis sp. - Myzocallis

Oak Leaf Aphids - Myzocallis sp. - Myzocallis
San Jose, Santa Clara County, California, USA
February 7, 2006
Size: 1/16 inch
Genus Myzocallis has 37 species. Once entomologist Dr. Chris Dietrich (http://www.inhs.uiuc.edu/staff/index.php?action=list&user_name=chdietri) told me this was an aphid (duh!) it was fairly easy to tentatively identify further (http://www.fs.fed.us/r8/foresthealth/pubs/oakpests/p29.html). Can anyone out there simply state how it is some have wings and some do not? (Note: in the background are Oak Treehopper nymphs.)

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Oak Leaf Aphids - Myzocallis sp. - Myzocallis Oak Leaf Aphids - Myzocallis sp. - Myzocallis

Moved
Moved from Aphids.

Winged/Not Winged
Like most winged insects, aphids don't develop wings until their final molt, at which time they're adults. Also, many species alternate between winged and wingless generations (not to mention parthenogic and sexually-reproducing).

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