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A cytostome or cell mouth is a part of a cell specialized for phagocytosis
Phagocytosis

File:Phagocytosis in three steps.pngPhagocytosis is the cell process of Phagocytes and Protists of engulfing solid particles by the cell membrane to form an internal phagosome, which is a food vacuole, or pteroid....
, usually in the form of a microtubule
Microtubule

Microtubules are one of the components of the cytoskeleton. They have a diameter of 25 Nanometre and length varying from 200 nanometers to 25 micrometers....
-supported funnel or groove. Food is directed into the cytostome, and sealed into vacuole
Vacuole

A vacuole is a membrane organelle which is present in all eukaryotic cells. Vacuoles are essentially enclosed compartments which are filled with fluid such as water or various enzymes, though in certain cases they may contain solids which have been engulfed....
s. Only certain groups of protozoa
Protozoa

Protozoan are microorganisms classified as unicellular eukaryotes. While there is no exact definition of the term "protozoan", most scientists use the word to refer to a unicellular heterotrophic protist, such as an amoeba or a ciliate....
, such as the ciliate
Ciliate

The ciliates are a group of protists characterized by the presence of hair-like organelles called cilium, which are identical in structure to flagellum but typically shorter and present in much larger numbers with a different undulating pattern than flagella....
s and excavate
Excavate

The excavates are a major assemblage of protists, often known as Excavata. The phylogenetic category Excavata contains a variety of free-living and symbiotic forms, and includes some important parasites of humans....
s, have cytostomes. Such examples include Balantidium coli - a ciliate. In others, and in cells from multicellular organisms, phagocytosis takes place at any point on the cell or feeding takes place by absorption.






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A cytostome or cell mouth is a part of a cell specialized for phagocytosis
Phagocytosis

File:Phagocytosis in three steps.pngPhagocytosis is the cell process of Phagocytes and Protists of engulfing solid particles by the cell membrane to form an internal phagosome, which is a food vacuole, or pteroid....
, usually in the form of a microtubule
Microtubule

Microtubules are one of the components of the cytoskeleton. They have a diameter of 25 Nanometre and length varying from 200 nanometers to 25 micrometers....
-supported funnel or groove. Food is directed into the cytostome, and sealed into vacuole
Vacuole

A vacuole is a membrane organelle which is present in all eukaryotic cells. Vacuoles are essentially enclosed compartments which are filled with fluid such as water or various enzymes, though in certain cases they may contain solids which have been engulfed....
s. Only certain groups of protozoa
Protozoa

Protozoan are microorganisms classified as unicellular eukaryotes. While there is no exact definition of the term "protozoan", most scientists use the word to refer to a unicellular heterotrophic protist, such as an amoeba or a ciliate....
, such as the ciliate
Ciliate

The ciliates are a group of protists characterized by the presence of hair-like organelles called cilium, which are identical in structure to flagellum but typically shorter and present in much larger numbers with a different undulating pattern than flagella....
s and excavate
Excavate

The excavates are a major assemblage of protists, often known as Excavata. The phylogenetic category Excavata contains a variety of free-living and symbiotic forms, and includes some important parasites of humans....
s, have cytostomes. Such examples include Balantidium coli - a ciliate. In others, and in cells from multicellular organisms, phagocytosis takes place at any point on the cell or feeding takes place by absorption.