Arrow Worms: Chaetognatha - Physical Characteristics, Behavior And Reproduction, No Common Name (pterosagitta Draco): Species Accounts, No Common Name (eukrohnia Fowleri): Species Accounts - GEOGRAPHIC RANGE, HABITAT, DIET, ARROW WORMS AND PEOPLE, CONSERV
water animals live dwelling
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.
Additional Topics
Arrow worms are long, straight, narrow sea worms that use hooks for catching prey. Arrow worms that live near the surface are clear, which helps them avoid predators. The intestines of species that live in middle depths often are yellow or red because they eat prey of those colors. Species that live in deeper water are more muscular and less clear than those that live near the surface. Folds of th…
Arrow worms position themselves at an angle in the water. When their side bristles detect something moving in the water, the worms quickly sweep their tail, swim rapidly in the direction of the prey, and grab the prey using hooks. Scientists believe arrow worms use venom to immobilize their prey after capturing it. Arrow worms that live in middle depths usually swim to the surface at night to feed…
Physical characteristics: Pterosagitta draco worms have eight to ten hooks, six to ten front teeth, and eight to eighteen back teeth. The body length reaches 0.4 inches (11 millimeters), and the tail length is about one-third the length of the body. These worms have one pair of fins on the tail. The eyes are small with T-shaped color spots. Geographic range: Pterosagitta draco (abbreviated to P. d…
Physical characteristics: Eukrohnia fowleri worms have eight to fourteen hooks and two to thirty-one back teeth. There are no front teeth. The body reaches a length of about 1.5 inches (40 millimeters), and the tail length is about one-fourth the length of the body. The neck is narrower than the division between the trunk and the tail. There are long fins on the sides of both the trunk and the tai…
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User Comments
about 1 year ago
Savannah
How for sure do you know they live in every part of the ocean?
4 months ago
html
what abuot their predadors