Vannella lata Page, 1988

Patsyuk, M. K., 2016, New Finds Of Naked Amoebae (Protista) In Water Reservoirs Of Ukraine, Vestnik Zoologii 50 (4), pp. 291-300 : 294-295

Vannella lata Page, 1988

The species belongs to the fan-shaped morphotype (fig. 4). The locomotive forms are crescent in shape. The amoeba is wider than long. The hyaline edge elongates when the cell changes the direction of its movement and hugs the cell’s sides. The cytoplasm does not form pseudopodia or subpseudopodia. There are no uroidal structures. The contractile vacuoles are mostly situated near the hyaline edge. The cell’s posterior is conical. The dimensions of the locomotive form are 35–52 µm, the L/B ratio is 0.5–1.5. The single nucleus is 3–5 µm in diameter. The floating form has long sharp radial subpseudopodia (fig. 4, 8).

We did not observe any cyst formation.

The diagnosis of the species includes a fan-shaped body, the cell’s width is twice its length, the floating form has long sharp pseudopodia whose length exceeds their diameter ( Page, Siemensma, 1991).

V. lata is known from the water bodies of Europe ( Page, Siemensma, 1991). We have previously found V. lata in the water bodies of Zhytomyr, Volyn and Kyiv

Polissia ( Patcyuk, Dovgal, 2012; Patsyuk, 2014 c). The Dnieper River in the vicinities of

Kherson (Kherson Region) is a new locality