Thecamoeba quadrilineata (Carter, 1856)

Patsyuk, M. K., 2015, Species Of Naked Amoebae (Protista) New For The Fauna Of Ukraine, Vestnik Zoologii 49 (5), pp. 387-392 : 389

Thecamoeba quadrilineata (Carter, 1856) ( fig. 2 )

The species belongs to the striate morphotype. The amoeba is elongated oval. There are several parallel dorsal folds (4–5) that extend along the cell from end to end. Hyaloplasm is undulating dorso-ventral crescent that makes up almost ¾ of the cell. There is singular large contractile vacuole of inconstant form. Cytoplasmic crystals are absent. The length of amoeba is 40–82 μm, the width is 20–40 μm, L/B ratio = 1.3–2.2. The diameter of a single nucleus is 8–12 μm.

Remarks: the species can be distinguished from other species of Thecamoeba genus by the shape and length of the cell, and vesicular nucleus with central nucleolus. The thin inner nuclear lamina is absent. The nucleus and nucleolus are distorted ( Smirnov, Goodkov, 1993; Page, 1988; Page, Siemensma, 1991).

Distribution: T. quadrilineata occurs in Asia, Europe, and North America ( Page, Siemensma, 1991).

Habitats: we the species in lakes (near Zoriane and Chornorudka villages, Ruzhynsky District of Zhytomir Region; also near Tsegiv village, Gorokhivsky District and Bubniv village , Lokachivsky District of Volyn Region) .

Figures

Fig. 2. Thecamoeba quadrilineata, locomotory forms (a, b). x1240.