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Trichamoeba sinuosa
Trichamoeba sinuosa, 170 µm

Trichamoeba sinuosa Siemensma & Page, 1986

Diagnosis: fast locomotion in typical zigzag shape; uroid bulbous, smooth or with short villi; usually with many bipiramidal crystals; nucleus with small peripherally arranged nucleoli.

Dimensions: length 125-325 µm, mean 200 µm; L:B > 4, usually >5; nucleus ca. 14-27 µm, mean 20 µm.

Ecology: on water plants and on the bottom of different types of water; the type material was collected from a polluted canal in Kortenhoef (The Netherlands).

Remarks: the monopodial form is a typical zigzag movement, hence the name ‘sinuosa’. Cysts have two small nuclei; up to 3 ectolayers.

T. sinuosa resembles a Saccamoeba, but can be distinguished from the latter by its characteristic granular nucleus.

This amoeba is not rare, and easy to culture. In cultures specimens with two nuclei have been observed.

Trichamoeba sinuosa
Trichamoeba sinuosa, 180 µm long, nucleus 20 µm – floating detritus, Naardermeer
Trichamoeba sinuosa
Trichamoeba sinuosa, 180 µm long, nucleus 20 µm – floating detritus, Naardermeer
Trichamoeba sinuosa
Trichamoeba sinuosa, 170 µm long, nucleus 19.8 µm – detritus, Laegieskamp
Trichamoeba sinuosa
Trichamoeba sinuosa
Nucleus, 20 µm and nucleus, 22.9 µm
Trichamoeba sinuosa
Trichamoeba sinuosa, nucleus 19.8 µm
Trichamoeba sinuosa
Trichamoeba sinuosa, 170 µm
Trichamoeba sinuosa - arrow points to the nucleus.
Uroid and contractile vacuole
Trichamoeba sinuosa
A-C monopodia with typical zigzag shape; D-F amoeba changing direction; I cyst with two nuclei (K); J nucleus (drawing: Ferry Siemensma)
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