Bathynellacea are part of a complex groundwater bio-coenosis made up of bacteria, protozoans, fungi, and meta-zoans (animals). All of these organisms act together to decompose particles washed into the groundwater from outside. These particles would otherwise clog the spaces between the sand grains, preventing groundwater from circulating freely. Bigger particles are broken up by Bathynellacea, and after they are passed through the gut, they are further degraded by protozoans and bacteria. Thus the interstitial spaces are kept open. Humans benefit from this ecological service because it helps to keep drinking water clean.
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