U.S. Fish and Wildlife Service
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The juvenile is approximately 0.75 millimeters long; it is shown next to the head of a pin for size comparison. Life History
Lampsilis higginsii juvenile next to a pinhead
Source: Roger Gordon, U.S. Fish & Wildlife Service

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Department of the InteriorU.S. Fish & Wildlife ServiceU.S. Geological Survey
Last updated on September 9, 2003
http://www.fws.gov/midwest/mussel/images/lampsilis_higginsii_juvenile_pinhead.html