Lophotrochozoa protostome worms {proboscis worm} (Nemertea) can be harmless, live in ocean, be 20 centimeters to 2 meters long, have narrow bodies, and have complete digestive tracts. Proboscis worms have circulatory systems, containing red blood cells, separate from digestive systems. They have two nerve ganglia connected by one nerve-fiber ring, with two long nerves down back. They have flame cells.
Proboscis worms have one long hollow muscular tube {proboscis}|, which everts from anterior end to get food.
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0225