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A group of Star Coral polyps feeding.

Credit: © Marty Snyderman38051

Purple Tube Sponge.

Credit: © Hal Beral97245

Hydra littoralis, a multicellular, freshwater organism which attaches to submerged leaves, rocks or twigs. It uses its tentacles to capture prey that passes by. SEM X27.

Credit: © Dr. Stanley Flegler228394

Bleached Coral (Pocilloporo elegans), Cabo San Lucas. Mexico, caused by El Nino conditions.

Credit: © Daniel Gotshall228918

Sponge on a coral reef.

Credit: © James Watt280119

Nematocyst (ejected tubule) from a tentacle of the Box Jellyfish (Carybdea alata). SEM X600.

Credit: © Dr. Dennis Kunkel284703

Sea Gooseberry Comb Jelly with commensal hyperiid Amphipods.

Credit: © David Wrobel301456

Sea Nettle Jellyfish (Class Scyphozoa).

Credit: © David Wrobel301458

Obelia, a marine colonial hydrozoan showing reproductive polyps and feeding polyps. LM X28.

Credit: © Dr. David Phillips902013

Released nematocysts (ejected tubules) from the tentacle of a Box Jellyfish (Carybdea alata). SEM X140.

Credit: © Dr. Dennis Kunkel284701