In 1935, J. F. Clark collected two specimens of a large branchiopod near Coulee City, Washington.
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These specimens were sent to James E. Lynch of the University of Washington in Seattle, who visited sites between Coulee City and the Grand Coulee Dam in 1936, and discovered further specimens.
Thesprotia gigas | Seagrass bed with dense ''Thalassia testudinum'' and an immature queen conch (''Eustrombus gigas | Hydrodynastes gigas | Holmskioldia gigas | Entada gigas |