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Plecoptera Slide Collection The Cornell University Insect Collection contains the important Plecoptera collections of Peter W. Claassen and James G. Needham. This page provides access to a database of the slide mounted specimens. Both adult and immature specimens were prepared and include mounts of whole specimens, terminalia and gonads, antennae, cerci, mouth parts, legs, and disarticulated body sclerites. The collection is comprised primarily of North American species, with a minor component of South American, Asian (primarily Himalayan), and Palearctic specimens - searchable database