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Answer for the clue "In some recent classifications, coextensive with the Ciliata minute organisms found in decomposing infusions of organic matter ", 9 letters:
infusoria

Word definitions for infusoria in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Infusoria \In`fu*so"ri*a\, n. pl. [NL.; -- so called because found in infusions which are left exposed to the air for a time. See Infuse .] (Zo["o]l.) One of the classes of Protozoa, including a large number of species, all of minute size. Formerly, the ...

Wiktionary Word definitions in Wiktionary
n. 1 (en-irregular plural of: infusorium ) 2 (context biology English) The many minute aquatic creatures, such as protozoa and unicellular algae found in fresh water habitats

Wikipedia Word definitions in Wikipedia
Infusoria is a collective term for minute aquatic creatures such as ciliates , euglenoids , protozoa , unicellular algae and small invertebrates that exist in freshwater ponds . Some authors (e.g., Bütschli ) used the term as a synonym for Ciliophora . ...

Usage examples of infusoria.

In all cases the bladders with decayed remains swarmed with living Algae of many kinds, Infusoria, and other low organisms, which evidently lived as intruders.

The bit on the moss swarmed with infusoria, and was so much decayed that the transverse striae on the muscular fibres could no longer be clearly distinguished.

The Infusoria, Foraminifera, and Sponges, with some other forms, belong to this division.

Scores of tourists walked about, buying trinkets - carved rock, elaborately patterned fabrics, nacreous jewels that were secreted in the bellies of the Kmaush, perfumes pressed from seaweed, statuettes, tiny aquaria in sealed globes, with a microscopic lens through which could be seen weirdly beautiful seascapes peopled with infusoria, tiny sponges, corals, darting squids, infinitesimal fish.

Loeb--all he did was to restate destiny, one of humanity's oldest ideas, in the terms of tropisms, infusoria and light.

Were it only by the identity of the law, the evolution of the comet in the firmament to the whirling of the infusoria in the drop of water.