Bacillaria paxillifera syn Bacillaria paradoxa, Nitzschia paradoxa
Commonly referred to as the "Carpenter's Rule" diatom because it slides through the water unfolding like a carpenter's wooden ruler. Cells average 108µ long and 5µ wide, with a total volume of 840.38 cubic microns. Chains of N. paradoxa are not frequently seen in the Rhode River, but due to the drought of 2002 the high salinity has brought them back. Several chains were found in this whole water sample. It was collected in the Rhode River in late November. Salinity was 20ppt at the time.