- Caption: Centric diatoms. Diatoms are a kind of algae that have hard outer shells made of silica, the essential component of glass. They are one of the most abundant creatures found in the bay. Size: 0.08–.3 mm. Notes: Mostly diatoms, collected with 80 micron plankton net, Location: Beneath the Golden Gate Bridge, San Francisco, California, Contact: David Liittschwager, Natural History Photography, 120 Parnassus Avenue #1, San Francisco, CA 94117, cell: 415 531 6882, email: liittschwager@mac.com
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