acorn worm meaning
Any of various wormlike sea-animals (enteropneusts) of the Hemichordata which have a proboscis and collar somewhat like an acorn in shape
- Acorn worms breathe by drawing in oxygenated water through their mouth.
- Thus, the acorn worm breathes about the same way as fish.
- Acorn worms are solitary worm-shaped organisms.
- Acorn worms move only sluggishly, using ciliary action and peristalsis of the proboscis.
- Among lesser phyla of invertebrates are the Hemichordata, or acorn worms, and the Chaetognatha, or arrow worms.