Diatoms

Eucampia, a chain-forming diatom

Thalassionema, a chain diatom

Chaetoceros, a diatom common in northeastern U.S. waters

Thalassiosira, a chain-forming diatom

Pleurosigma, a single-celled diatom found in costal northeast waters

The diatom Licmophora, found in coastal waters off Woods Hole, Mass.