- Caption: Common Name: hydrozoan jellyfish, Scientific Name: Polyorchis penicillatus, 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. Class Hydrozoa, Order: Hydroida, Family: Polyorchidae, Location: Beneath the Golden Gate Bridge, San Francisco, California, Latitude: 37.82239565, Longitude: -122.48434066
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