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Vannella lata Type strain CCAP 1589/12.

Olympus CK2, Phase contrast
Locomotive forms, floating forms.

Photo: A.Smirnov

Basic references for identification:

  • Page F.C. 1988. A new key to freshwater and soil Gymnamoebia. FBA, Ambleside.
    Vannella lata Page, 1988 CCAP 1589/12 (type strain)

  • Fan-shaped, crescent-shaped or semicircular amoeba. Frontal hyaloplasm consistes from half to two thirds of the body, usually it formes an anterior hyaline crescent. Frontal hyaloplasm smooth. Breadth of the locomotive form normally greater than length. Maximal dimension of the locomotive form 33 mkm. Length/Breadth ratio 0.5 - 1.0 (average 0.6).

  • Floating form with 3-14 long, tapering radiating pseudopodia.

  • Uninucleate, vesicular nucleus about 3.7 - 6.5 mkm in diameter (average 5.1 mkm). Single, central, optically homogenous nucleolus. No crystals in the cytoplasm. distinctive contractile vacuole. No cysts observed.

  • Cell coat consisting of glycostyles, about 130 nm in length without accociated simple filaments.

  • Freshwater. Feeds on bacteria. The only known isolate is the type one.
    Observed habitat: Scotland, Freshwater.

  • Identification of a species is difficult. Most remarkable detail is the breadth greater than lenght (often much greater, the cell looks crescent-shaped) and the organisation of the floating form. I never identified any natural isolate as V. lata yet.

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