Kidneyshells are "fly fishermen".  The glochidia are enclosed in membranous capsules (ovisacs) that are remarkably decorated to mimic host prey items.  In the fluted kidneyshell, the ovisacs resemble aquatic insects, particularly the pupae of blackflies (Simulidae).   Each ovisac has a transparent, adhesive "tail", which tethers it to objects on the stream bed after release from the female mussel.  Water movements cause the ovisac to move, attracting the host fish (primarily darters).  When a fish bites the ovisac, glochidia are forced out through the "eyes", or are released by rupture of the ovisac, and then attach to the gills of the host.