Definition: The word "acanthopterous" comes from Greek, acanthus (a tree) and "optera", meaning "beast". It means "having or displaying a large number of tentacles and the ability to move freely without using any limbs". Acanthopterous animals are typically characterized by their long, strong tentacles that they use for grasping, moving objects, and sensing. They have an eight-inch tentacle called a caudal peduncle that is used for grasping small prey or in defense of themselves when threatened. Some examples of acanthopterous animals include jellyfish, octopuses, sea cucumbers, and some types of jellyfish (like the "cactus jellyfish" or "giant bivalve jellyfish") that are able to move rapidly and use their tentacles for defense.
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