[ in-faw-nuh ]
/ ˈɪnˌfɔ nə /

noun, plural in·fau·nas, in·fau·nae [in-faw-nee] /ˈɪnˌfɔ ni/. Ecology.

the aggregate of animals that burrow into and live in the bottom deposits of an ocean, river, or lake.
Compare epifauna.

Origin of infauna

First recorded in 1910–15; in-1 + fauna


in·fau·nal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science definitions for infaunal

[ ĭnfô′nə ]

Benthic animals that live in the substrate of a body of water, especially in a soft sea bottom. Infauna usually construct tubes or burrows and are commonly found in deeper and subtidal waters. Clams, tubeworms, and burrowing crabs are infaunal animals. Compare epifauna.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.