The tessellated darter (Etheostoma olmstedi) is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is native to Canada and the United States. It was formerly considered a subspecies of the johnny darter, which it greatly resembles in general appearance. Distribution: St. Lawrence River in Quebec and Ontario (absent in Maine, USA) in Canada to Altamaha River in Georgia, USA; in St. Johns River drainage in Florida and in Lake Ontario drainage in New York in the USA.
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