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In a body of fresh water, that part of the environment composed of a sandy beach and bottom lakeward from the water line.
Organisms which inhabit the interstitial water in the sands on a lake shore.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the microscopic organisms that inhabit moist sand along rivers and lakes. Psammon is most abundant at depths 0.5–1 cm from the soil surface. It consists of many diatomaceous, protococcal, and blue-green algae; it also includes infusorians, testaceans, rotifers, tubellarians, roundworms, oligochaete worms, chironomid larvae, and other animals that can move in the interstices of sand. Sometimes microscopic organisms that live in littoral marine sands are also called psammon.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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A total of 13 taxa of testate amoebae were recorded from the psammon of the Gulf of Finland in this study.
The number of rotifer species found in the psammon from lakes Vortsjarv and Saadjarv resembles the numbers previously recorded from some Polish lakes with a similar trophic level; moreover, quite a few species overlapped in the two countries (Radwan and Bielahska-Grajner, 2001; Ejsmont-Karabin, 2005).
Besides, variability between samples of psammon communities was higher in lake than in coastal beaches.
The biodiversity of psammon rotifers in Wloclawek Reservoir.
Psammon rotifers in two lakes of different trophy--their abundance, species structure and role in phosphorus cycling.
Rotifera of lake psammon: community structure versus trophic state of lake waters.
Psammon ciliates: diversity and abundance in hygroarenal of eutrophic lake.
Community structure of psammon ciliates in sandy beaches of lakes.