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Close-up of the conglutinate of Wabash pigtoe, Fusconaia flava. This mussel and some of its relatives form conglutinates that include structural eggs (the red eggs without glochidia in the photograph). The structural eggs do not develop and they help to hold the conglutinate together and give it color. The fertile eggs contain glochidia and weaken so as to rupture and release the glochidia when struck by the host fish.
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