- Caption: Common Name: hydrozoan jellyfish, Scientific Name: Obelia spp., Size: 0.1” (2.5 mm), Notes: this is the free swimming lifestage, called a medusa, of a hydroid. It is not a true jellyfish although its form is very similar. 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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