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Arrow Worms: Chaetognatha

Physical Characteristics, Behavior And Reproduction, No Common Name (pterosagitta Draco): Species Accounts, No Common Name (eukrohnia Fowleri): Species AccountsGEOGRAPHIC RANGE, HABITAT, DIET, ARROW WORMS AND PEOPLE, CONSERV

NO COMMON NAME (Pterosagitta draco): SPECIES ACCOUNTS
NO COMMON NAME (Eukrohnia fowleri): SPECIES ACCOUNTS

Arrow worms live in all the oceans of the world.

Arrow worms live in every part of the ocean. Most drift in open water close to the surface. Bottom-dwelling species live attached to objects such as sea grass and rocks.

Arrow worms eat plankton, including tiny crustaceans, fish larvae, and other arrow worms. Digestion is rapid. Scientists believe each arrow worm eats two to fifty prey animals each day. Plankton is tiny plants and animals drifting in water. Crustaceans (krus-TAY-shuns) are water-dwelling animals that have jointed legs and a hard shell but no backbone. Larvae (LAR-vee) are animals in an early stage that change form before becoming adults.


Arrow worms are used as indicators to determine the level of water from the Atlantic Ocean moving into the North Sea.


Arrow worms are not considered threatened or endangered.

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