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Vannella platypodia CCAP 1589/2.
Olympus CK2, Phase contrast
Locomotive and floating forms.

Strain from Valamo Island (North Western Russia) that I beleive to be Vannella platypodia
MBI 15-2, Phase contrast; PZO UB2, DIC
Various locomotive forms.

Strain from Valamo Island (North Western Russia) that I beleive to be Vannella platypodia. Ultrastructure. Scale bar 500 nm.

Photo, TEM: A.Smirnov

Basic references for identification:

  • Page FC (1976) An Illustrated Key to Freshwater and Soil Amoebae. Freshwater Biol Assoc, Ambleside
  • Page FC (1988) A new key to freshwater and soil gymnamoebae. Freshwater Biol Assoc, Ambleside, UK
    Vannella platypodia(Glaeser, 1912) Page, 1976 CCAP 1589/2

  • Fan-shaped or semicircular vannella, often with pronounced "tail". Frontal hyaloplasm consists up to half of the body and can form an anterior hyaline crescent. In CCAP strain the anterior edge of the cell looks uneven, wavy but it may be because of lasting maintenance of this strain on the agar without overlay. Locomotive form 10-30 mkm in lenght and breadth.

  • Radial floating form with 2-8 thin, tapering radiating pseudopodia. Pseudopodia of not well-developed floating form may be curved; in old floating forms - spirally coiled.

  • Uninucleate, vesicular nucleus about 3.4 -5 mkm in diameter. Single, central, optically homogenous nucleolus about 3 mm in diameter (when measured in live specimens). No crystals in the cytoplasm. One or two large, distinctive vacuoles that do not contract normally present. No cysts observed.

  • Cell coat consisting of glycostyles, about 130 nm in length with accociated simple filaments.

  • Freshwater, known from numerous locations in Europe and North America

  • Identification of a species may be difficult. It seems to be that V. platypodia is rather polymorphic and I hardly will be surprised if future studies reveal a complex of V. platypodia - like species. As a basic features for identification I can note the apperance of cell, the floating form and size of the cell. It is desirable to check the presence of simple filaments in the cell coat.

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