
1) Class 2) Subclass infusoria
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https://www.crosswordclues.com/clue/infusoria

Infusoria is a collective term for minute aquatic creatures such as ciliates, euglenoids, protozoa, unicellular algae and small invertebrates that exist in freshwater ponds. In modern formal classifications, the term is considered obsolete; the microorganisms previously included in the Infusoria are mostly assigned to the kingdom Protista. ==Myone...
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http://en.wikipedia.org/wiki/Infusoria

• (n. pl.) One of the classes of Protozoa, including a large number of species, all of minute size.
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http://thinkexist.com/dictionary/meaning/infusoria/

Microscopic or minute animal life which commonly occurs in water containing decaying organic matter. Includes paramecia, euglena, desmids, rotifers and others. Cultivated as food for Fry and small fishes.
Found on
http://www.aquahobby.com/articles/e_glossary.php

<zoology> One of the classes of Protozoa, including a large number of species, all of minute size. ... They are found in all seas, lakes, ponds, and streams, as well as in infusions of organic matter exposed to the air. They are distinguished by having vibrating lashes or cilia, with which they obtain their food and swim about.They are devide...
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http://www.encyclo.co.uk/local/20973

A nonspecific reference to a heterogeneous assemblage of microscopic organisms, including but not limited to protozoans; cultured from decomposing organic material by fish breeders as a first food for very small fish fry. The term may also be used even in reference to relatively pure cultures of a single organism (for example, a particular species of Paramecium), and/or to relatively large one-celled organisms that, while small, are nevertheless visible to the unaided eye....
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In`fu·so'ri·a noun plural [ New Latin ; -- so called because found in infusions which are left exposed to the air for a time. See
Infuse .]
(Zoology) One of the classes of Protozoa, including a large number of species, all of minute size. » They are found in all seas, lakes, ...
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http://www.encyclo.co.uk/webster/I/58

Type: Term Pronunciation: in′fyū-sō′rē-ă Definitions: 1. Archaic term for Ciliophora.
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http://www.medilexicon.com/medicaldictionary.php?t=44561

Infusoria is a class of minute, mostly microscopic, animals, so named from being frequently developed in organic infusions, provisionally regarded as the highest class of the Protozoa. They are provided with a mouth, are destitute of pseudopodia, but are furnished with vibratile cilia. Most are free-swimming, but some form colonies by budding, and ...
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http://www.probertencyclopaedia.com/browse/BI.HTM

[
n] - in some recent classifications, coextensive with the Ciliata: minute organisms found in decomposing infusions of organic matter
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http://www.webdictionary.co.uk/definition.php?query=Infusoria
subclass Infusoria noun in some recent classifications, coextensive with the Ciliata: minute organisms found in decomposing infusions of organic matter
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https://www.encyclo.co.uk/local/20974

protozoans of the phylum Ciliophora (or class Ciliata). · (formerly) any of various microscopic organisms found in infusions of decaying organic matter.
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https://www.infoplease.com/dictionary/infusoria
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