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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Impacts to beach infauna are expected to include reduced abundance and altered
  community structure.
It was feared that if discharged it might sink and lie on the bottom, killing
  all benthic infauna.
The third objective was to examine the spatial nature of the benthic infauna
  response to freshwater runoff.
Reference samples also had little infauna in each sample.
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