from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Aquatic animals that live in the substrate of a body of water, especially in a soft sea bottom.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An aquatic organism that lives within the dominant medium of its environment.
in-2 + fauna.(American Heritage® Dictionary of the English Language, Fourth Edition)
The infauna occur in pockets of sediment on the rocky wall.