Meiobenthos (meso) - organisms ranging in size from 0.1 to 2 mm. It includes lower crustaceans (ostracodes, herpacticids, etc.), small oligochaetes, fish eggs.

Small aquatic organisms living on the bottom that pass through a sieve with a mesh size of 1 mm and are trapped in a sieve with a mesh size of 32 ┬Ám. Meiobenthos animals live in the thickness of loose bottom soil (silt, sand), between its particles. The main representatives of meiobenthos are foraminifera, solitary hydroids, rotifers, free-living nematodes, various small crustaceans (barnacles, harpacticoids, equinae, etc.), small ringworms (polychaetes and oligochaetes), cynorhynchs, gastrotrichs. As a rule, the most abundant animals in marine meiobenthos samples are nematodes (70-100 %), with harpacticoids being the second most abundant.

A distinction is made between eumaeobenthos (organisms measuring 2 mm as adults) and pseudomeiobenthos (organisms up to 2 mm. only in early stages of development).

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