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The spine-cheek anemone-fish, in the bulb-tentacled anemone. The spine-cheeked anemonefish varies from red to almost black.

A pair of Amphiprion ocellaris, in Haddon's anemone. This is not a known association in the wild.

Sea Anemones

Some of the giant reef anemones can reach a meter in diameter. All have zooxanthellae, and are thus found in relatively shallow water. They derive most of their nutrition from the algae, but also consume plankton and any other small animal unlucky enough to blunder into their tentacles.

Anemones can live to a ripe old age. In the 19th century, British naturalist John Dalyell kept a coldwater Actinia sp. anemone for 66 years. Over this period, it produced 750 young (by budding), 150 of these after the age of 50. The anemone eventually outlived the scientist.

Some 10 species of Indonesian anemones, in three families, host clownfish. The systematics of this group was in some confusion until Dr. Daphne Fautin reorganized it in 1981.

Cryptodendrum adhaesivum. Lies flat; very short tentacles. Hosts only Clark's anemonefish.