Giardia lamblia
The mammalian intestinal parasite Giardia lamblia, visualized here using scanning electron microscopy, is a waterborne protist that causes severe diarrhea when ingested.
Source
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"OpenStax College, Groups of Protists. October 16, 2013."
http://cnx.org/content/m44617/latest/Figure_23_03_02.jpg
OpenStax CNX
CC BY 3.0.
