Tetrahymena pyriformis
Scientific classification
Domain:	Eukaryota
Clade:	Diaphoretickes
Clade:	SAR
Clade:	Alveolata
Phylum:	Ciliophora
Class:	Oligohymenophorea
Order:	Hymenostomatida
Family:	Tetrahymenidae
Genus:	Tetrahymena
Species:	T. pyriformis
Binomial name
Tetrahymena pyriformis (Ehrenberg, 1830) Furgason, 1940
Synonyms[1]
Colpoda pirum Müller, 1786 Kolpoda pirum Müller, 1786 Leucophrys pyriformis Ehrenberg, 1830 Saprophilus oviformis Kahl, 1926 Sathrophilus oviformis Tetrahymena geleii Furgason, 1940 Tetrahymena pyriformis-komplex Trichoda pyrum Ehrenberg, 1830

Tetrahymena pyriformis is a species of Ciliophora in the family Tetrahymenidae.^{[2][unreliable source?]}

It is one of the most commonly ciliated model used for laboratory research.^[3]

The species is widely distributed. It lives in fresh water like springs, ditches, creeks, ponds, and lakes.^[4]: 3