Abstract
ABSTRACT Within navigation pools of the upper Mississippi River, the caddisfly Oecetis inconspicua uses molluscs for pupation sites. This association apparently forms out of the need of Oecetis for a solid substrate to pupate on within a habitat dominated by soft shifting substrates. Oecetis generally colonized pelecypods and larger gastropods with an exposed shell surface area > 2.5 cm2. Oecetis was found only on the posterior exposed end of clams, but occurred somewhat randomly on snails. Few pupae were found on dead molluscs. Oecetis pupates on molluscs that can maintain a portion of their shell above the surface of the substrate, thus preventing pupal burial.
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