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Paramecium caudatum [1] is a species of unicellular protist in the phylum Ciliophora. [2] They can reach 0.33 mm in length and are covered with minute hair-like organelles called cilia. [3] The cilia are used in locomotion and feeding. [2] The species is very common, and widespread in marine, brackish and freshwater environments. [4] [5]
A diagram of Paramecium caudatum. Species of Paramecium range in size from 0.06 mm to 0.3 mm in length. Cells are typically ovoid, elongate, or foot- or cigar-shaped. The body of the cell is enclosed by a stiff but elastic structure called the pellicle.
Class Protocruziea Chen et al. 2015 [Protocruziidia de Puytorac, Grain & Mignot 1987] Class Colpodea Small & Lynn 1981; Class Nassophorea Small & Lynn 1981; Class Phyllopharyngea de Puytorac et al. 1974; Class Prostomatea Schewiakoff 1896; Class Plagiopylea Small & Lynn 1985 sensu Lynn 2008; Class Oligohymenophorea de Puytorac et al. 1974
Class: Oligohymenophorea: Order: Peniculida: Family: Parameciidae Dujardin 1840 [1] ... The family contains the genera Paramecium and Physanter. [1] References
Class: Alphaproteobacteria. Subclass: Caulobacteridae. Order: ... The member Holospora is an intracellular parasite found in the unicellular protozoa Paramecium. [1]
Class Protozoa, order Infusoria, family Monades by Georg August Goldfuss, c. 1844. ... Paramecium caudatum: free-living ciliate [51] 120–330 Amoeba proteus:
The peniculids are an order of ciliate protozoa, including the well-known Paramecium and related genera, such as Frontonia, Stokesia, Urocentrum and Lembadion. Most are relatively large, freshwater forms that feed by sweeping smaller organisms into the mouth. They have weird life cycles, and in many cases do not even form resting cysts.
Paramecium aurelia and Paramecium caudatum grow well individually, but when they compete for the same resources, P. aurelia outcompetes P. caudatum.. Based on field observations, Joseph Grinnell formulated the principle of competitive exclusion in 1904: "Two species of approximately the same food habits are not likely to remain long evenly balanced in numbers in the same region.