They anchor themselves to surfaces or sand with a sticky foot called a pedal disc. When small fish or crustaceans pass by and touch the tentacles around their mouths, sea anemones shoot a harpoon-like spear or nematocyst into their prey, injecting a paralyzing neurotoxin. They then use their tentacles to guide the food into their mouths. Luckily, only a few have stinging polyps that are harmful to humans. Some anemones have symbiotic relationships. The most well known is with the clownfish.
Some anemones also provide safe harbor to green algae in exchange for oxygen and sugar, the by-products of the algae's photosynthesis.
Some colonies of anemones fight other groups to protect their territories. Though sea anemones are not endangered, pollution, over-collection, trampling by careless visitors and other human activity can have a negative effect on them. Surviving Through Adaptation. Their bodies consist of a soft, cylindrical stalk topped by an oral disc surrounded with venomous tentacles.
At their base, they sport a single adhesive foot, called a basal disc, which they use to attach to underwater surfaces like rocks or shells. Anemones can have anywhere from a dozen to a few hundred tentacles. These cnidarians come in a variety of colors, decorating a tide pool or reef like a garden of wildflowers. Anemones are known to form symbiotic relationships with other animals; their most well-known alliance is with clownfish.
Learn more about anemones! Did you know that anemones can have anywhere from a dozen to a few hundred tentacles? Anemones are found worldwide in all marine habitats. They can be found in a range of temperatures, from the cold water of the north Pacific to the warm water of the Caribbean, and live at various depths, from the shallower waters of the tidal zone up to depths of 1.
Anemones are carnivorous, feeding on tiny plankton or fish. Their stinging tentacles are triggered by the slightest touch, firing a harpoon-like filament called a nematocyst into their prey. Once injected with the paralyzing neurotoxin, the prey is guided into the mouth by the tentacles. Bitter-Soto R. Benthic communities associated to Thalassia testudinum Hydrocharitaceae at three localities of Morrocoy National Park, Venezuela. Rev Biol Trop Biol Trop. Bosc LAG. Historie Naturalle des Vers.
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