Infusoria is a collective term for minute aquatic creatures like ciliates, euglenoids, protozoa, and unicellular algae that exist in freshwater ponds. In modern formal classifications the term is considered obsolete; and the microorganisms previously included in the Infusoria are mostly assigned to the Kingdom Protista.



In Infusoria and some Flagellates, the differentiated threads of ectosarc, which are contractile and doubly refractive, perform the function of muscular fibres in the Metazoa.

Aquarium use

Infusoria are used by owners of aquariums to feed fish fry; newly hatched fry of many common aquarium species can be successfully raised on this food during early development due to its size and nutritional content. Many home aquaria are unable to naturally supply sufficient Infusoria for fish rearing and hobbyists either create and maintain their own Infusoria cultures[1] or use one of the many commercial cultures available. Infusoria can be cultured by soaking any decomposing vegetative matter like papaya skin into a jar of aged water. The Infusoria culture will be done from 2-3 days depending on temperature and light received. The water will first turn cloudy, but it will clear up once the infusoria eat the bacteria which caused the cloudiness. At this point the Infusoria will be ready, and they will usually be visible to the naked eye as small, white specs swimming in the container.


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Look at other dictionaries:

  • 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 term… …   The Collaborative International Dictionary of English

  • Infusoria — Animal An i*mal, a. [Cf. F. animal.] 1. Of or relating to animals; as, animal functions. [1913 Webster] 2. Pertaining to the merely sentient part of a creature, as distinguished from the intellectual, rational, or spiritual part; as, the animal… …   The Collaborative International Dictionary of English

  • Infusoria — Als Infusorien (lateinisch Infusoria) oder Aufgusstierchen bezeichnet man kleine, sich z. B. im Aufguss von pflanzlichem Material entwickelnde Tierchen (z. B. Flagellaten, Wimpertierchen, Amöben). In Aquarien werden sie mitunter zur Anzucht von… …   Deutsch Wikipedia

  • Infusoria — noun in some recent classifications, coextensive with the Ciliata: minute organisms found in decomposing infusions of organic matter • Syn: ↑subclass Infusoria • Hypernyms: ↑class • Member Holonyms: ↑Ciliata, ↑class Ciliata, ↑Ciliophora, ↑ …   Useful english dictionary

  • Infusoria — /in fyoo sawr ee euh, sohr /, 1. protozoans of the phylum Ciliophora (or class Ciliata). 2. (formerly) any of various microscopic organisms found in infusions of decaying organic matter. [1780 90; < NL, neut. pl. of INFUSORIUS. See INFUSE,… …   Universalium

  • infusoria — noun the many minute aquatic creatures, such as protozoa and unicellular algae found in fresh water habitats …   Wiktionary

  • Infusoria — Archaic term for Ciliophora. [Mod. L. pertaining to or found in an infusion, fr. in fundo, pp. in fusus, to pour in] * * * in·fu·so·ria .in fyü zōr ē ə, sōr n pl, often cap organisms that are infusorians not used technically …   Medical dictionary

  • INFUSORIA —    a name given to certain classes of animalculæ engendered in stagnant water infused with decaying organic matter …   The Nuttall Encyclopaedia

  • Infusoria — in·fu·so·ri·a || ‚ɪnfjuː zɔːrɪə n. class of one celled organisms (Zoology) …   English contemporary dictionary

  • infusoria — n. pl. Animalcules, animalcula …   New dictionary of synonyms

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