
Meiobenthos, also called meiofauna, are small benthic invertebrates that live in both marine and fresh water environments. The term meiofauna loosely defines a group of organisms by their size, larger than microfauna but smaller than macrofauna, rather than a taxonomic grouping. In practice that is organisms that can pass through a 1 mm mesh but w...
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http://en.wikipedia.org/wiki/Meiobenthos

(from the article `benthos`) ...benthos are the macrobenthos, those forms larger than 1 mm (0.04 inch), which are dominated by polychaete worms, pelecypods, anthozoans, ... ...bivalves, ophiuroids, crinoids), and those that consume other fauna in the benthic assemblage are predators (e.g., starfish, gastropods). ... [2 related articl...
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http://www.britannica.com/eb/a-z/m/66

(Gk: meion less; benthos sea depth) benthic (bottom-living) organisms in size between 0.1 and 1mm; the larger microbes, consisting of foraminiferans, turbellarians, polychate worms, filling the roles of nutrient recylers, decomposers, primary producers and predators.
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http://www.seafriends.org.nz/books/glossary.htm

meiobenthos, meiobenthic 1. That section of the benthos that includes animals neither small enough to be grouped with the microfauna nor large enough to be grouped with the macrofauna. 2. Small benthic organisms that pass through 1 mm mesh sieve but are retained by a 0.1 mm mesh.
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http://www.wordinfo.info/words/index/info/view_unit/1315/
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