
1) Aquatic animalcule 2) Invertebrate 3) Minute aquatic animal 4) Plankton animal 5) Tiny aquatic organism 6) Tiny marine animal 7) Wheel animalcule
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https://www.crosswordclues.com/clue/rotifer

The rotifers (Rotifera, commonly called wheel animals) make up a phylum of microscopic and near-microscopic pseudocoelomate animals. They were first described by Rev. John Harris in 1696, and other forms were described by Anton van Leeuwenhoek in 1703. Most rotifers are around 0.1–0.5 mm long (although their size can range from 50 μm to over 2 ...
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http://en.wikipedia.org/wiki/Rotifer

• (n.) One of the Rotifera. See Illust. in Appendix.
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http://thinkexist.com/dictionary/meaning/rotifer/

any of the approximately 2,000 species of microscopic invertebrates that constitute the class Rotifera, or Rotaria (phylum Aschelminthes). Rotifers ... [6 related articles]
Found on
http://www.britannica.com/eb/a-z/r/70
Ro'ti·fer noun [ New Latin see
Rotifera .]
(Zoology) One of the Rotifera. See
Illust. in Appendix.
Found on
http://www.encyclo.co.uk/webster/R/96

[
n] - minute aquatic multicellular organisms having a ciliated wheel-like organ for feeding and locomotion
Found on
http://www.webdictionary.co.uk/definition.php?query=rotifer
noun minute aquatic multicellular organisms having a ciliated wheel-like organ for feeding and locomotion; constituents of freshwater plankton
Found on
https://www.encyclo.co.uk/local/20974

Any of the tiny invertebrates, also called `wheel animalcules`, of the phylum Rotifera. Mainly freshwater, some marine, rotifers have a ring of cilia that carries food to the mouth and also provides propulsion. They are the smallest of multicellular animals – few reach 0.05 cm/0.02 in
Found on
https://www.encyclo.co.uk/local/21221
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