in fauna

infauna

[in-faw-nuh]
noun, plural infaunas, infaunae [in-faw-nee] .
the aggregate of organisms that burrow into and live in the bottom deposits of the ocean.

Origin:
1910–15; in-1 + fauna; compare epifauna

infaunal, adjective
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American Heritage
Science Dictionary
infauna   (ĭn'fô'nə)  Pronunciation Key 
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.
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