Figure 1.

The pennate diatom Phaeodactylum tricornutum. (a) Light micrographs showing the three morphotypes of P. tricornutum: left, fusiform; top right, triradiate; bottom right, oval. (b) Light micrographs of a small cluster of cells of P. tricornutum. Each cell is approximately 15 μm in length. Images courtesy of Alessandra De Martino.