These small pennate Diatoms formed an extensive mat of "sheath-like" Tubes on the bottom of a salt marsh pond in Heron's Head Park salt marsh, near study site OS-1. In most of the Tubes the Diatoms were packed, but the sparse population of Diatoms in this Tube made possible videomicrography of the Diatoms moving slowly along the Tube. Microscopy was with Hoffman Modulation Contrast optics at 1,000x magnification, oil immersion. The videomicrograph was taken with a Nikon Coolpix P5100 attached to a threaded Leitz Wetzlar 10x eyepiece. How the Diatoms form the Sheath Tubes is not known.
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