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Invertebrate Guide - Sea Anemones |
Feature Article
for subscribing Members of CoralRealm.
Sea Anemones (Class Anthozoa)
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| The tentacles of this magnificent sea
anemone provide a refuge for a number of different shrimps, crabs and fishes. |
Sea anemones (order Actinaria) share the class Anthozoa with approximately 6,000 other invertebrate
species. Some of the other groups in this class include the corals, black corals,
tube anemones, zoanthids and corallimorpharians (mushroom anemones). The sea anemones are
solitary polyps, with a columnar body, an oral disc with a central slit-shaped mouth where
food is ingested and waste expelled, which is adorned with hollow tentacles. They range in size
from 1.5 cm (0.6 inch) in diameter to over 1 m (3.3 feet). The base of the sea anemone either
adheres to hard substrate, or it digs into the sand or mud. All the sea anemones occur in
marine habitats, and are especially abundant in shallow, tropical seas.
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