Abstract
ABSTRACT The majority of the presently recognized species of Nearctic freshwater sponges have been collected and reported from the State of Wisconsin. Important early contributions to freshwater sponge research were made by Minna E. Jewell and James R. Neidhoefer, both of whom deposited voucher specimens in the Milwaukee Public Museum. These authors included in their publications figures illustrating species diagnostic traits, based on examination of specimens with the light microscope. We re-examined their historically significant voucher specimens of Wisconsin sponge species using scanning electron microscopy and here provide a reference atlas of diagnostic criteria for these species. The material we have examined does not support a valid Wisconsin record for Spongilla aspinosa.
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