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Plecoptera. As in other aquatic orders, our collection of Plecoptera is very good, due to work by Needham, Claasen, and others. There are 3 drawers of pinned specimens, 5436 vials of alcohol-preserved specimens of both adults and nymphs, and 1246 microscope slide mounts of adult and immature structures. We have 114 primary types, and 156 secondary types. All type slides have been segregated with our type collection. See our type database (Search Types) for further information on holdings.