Home > Invertebrates > Hydroids > Various Hydroids

Updated 1/27/2013

Phylum Cnidaria, Class Hydrozoa


Various Hydroids


Pupukea Firehouse, Oahu, 25 feet


Cargo Pier, Midway Atoll, 5 feet



Sharks Cove Tidepool, Oahu


Sea Tiger wreck, Oahu, 100 feet

Benwood wreck, Key Largo, FL 40 feet





Makapu'u, Oahu, 15 feet


On Timea sponge, Blowhole, Oahu, 20 feet

These hydroids are less than 1 inch tall and virtually invisible to the naked eye.  Attached to virtually any firm surface including rocks, seaweeds, and man-made objects including docks and mooring lines.  Gloves should always be worm when snorkeling and diving, especially when using mooring lines for ascent/descent to avoid contact with their painful sting.