noun
- A small, transparent marine worm of the phylum Chaetognatha, typically found in plankton and characterized by arrow-shaped fins.
Usage: biology; also called chaetognath
Examples
- Arrowworms are abundant in ocean plankton and serve as an important food source for fish.
- The arrowworm's streamlined body makes it an efficient predator in the water column.
- Marine biologists study arrowworms to understand the structure of pelagic food webs.
- Arrowworms use their arrow-like fins to move quickly through the water.
- These tiny arrowworms are found in oceans worldwide, from surface waters to the deep sea.