U.S. Fish and Wildlife Service
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Each ovisac is a bag of several hundred glochidia. The envelop is easily ruptured when a fish bites the ovisac. The eyespots, in particular, are zones of weakness that tend to rupture. Life History
ovisacs
http://courses.smsu.edu/mcb095f/gallery/ouachita/kidneyshell.htm
Source: Chris Barnhart, Unio Gallery. Southwest Missouri University
Unio Gallery
http://courses.smsu.edu/mcb095f/gallery/

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Department of the InteriorU.S. Fish & Wildlife ServiceU.S. Geological Survey
Last updated on June 26, 2003
http://www.fws.gov/midwest/mussel/images/ovisacs.html