Basket stars are entirely marine invertebrate animals. Their bodies are composed of a central disk with many arms branching outward forming thousands of branchlets. When feeding, they extend several of their arms into the water, the branchlets spread out like a fan, macroscopic zooplankton are caught by an array of microscopic hooks on the arms. Branchlets in the vicinity curl and wrap around captured prey forming a localized knot, whilst mucus from glands further immobilize the prey. At some point knot-laden arms roll in towards the underside of the disk and the captured prey is transferred to the mouth.
Photo credit: @ annika.nor
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