Feron gigas
(agamic)agamic:The agamic (AKA unisexual) generation of an oak gall wasp (cynipini) species consists of only female wasps, which do not mate before laying the eggs which become the male and females of the sexual generation (sexgen).
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Location: upper leaf, lower leaf, between leaf veins
Form:
Cells:
Possible Range:
The gall's range is computed from the range of all hosts that the gall occurs on. In some cases we have evidence that the gall does not occur across the full range of the hosts and we will remove these places from the range. For undescribed species we will show the expected range based on hosts plus where the galls have been observed.
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Common Name(s):
Saucer Gall Wasp (unisexual generation)
Gall (pl, 17, fig, 18). — A spangle about 4 mm. in diameter, usually on the upper side of the leaf, saucer shaped, with a thin crenate margin when young in August and with a prominent hump in center, Wlien mature in fall there is a lens-shaped larval cavity inside, on the floor of which is a thin, white, circular disk from which prominent lines radiate. Galls on Quercus douglasii are less crenate.
Habitat. — The type is from a series of dead adults cut out of galls collected on Quercus dumosa at Los Gatos, Calif,, on December 13, 1935. Others, all from California, are from the San Bernardino Mountains, San Jacinto Mountains, and Banning; other paratypes emerged November 19, 1935, from galls collected at Colfax, on Quercus douglasii a few days previously ; others are from Stanford University and Angels Camp. Similar galls have been seen on Quercvs engelmanni at Santa Anita, Calif. Adults not included in the type series have been reared from galls on Quercus garryana at Siskiyou summit north of Holbrook, Calif.
