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Vannella devonica CCAP 1589/5.

Olympus CK2, Phase contrast
Locomotive forms, nucleus.

Photo: A.Smirnov

Basic references for identification:

  • Page F.C. (1979) Two genera of marine amoebae (Gymnamoebia) with distinctive surface structures: Vannella Bovee, 1965, and Pseudoparamoeba n.g., with two new species of Vannella. Protistologica 15:245-257
  • Page F.C. (1983) Marine gymnamoebae. Inst. Terr. Ecol. 54pp.
    Vannella devonica Page, 1979 CCAP 1589/5

  • Fan-shaped or semicircular Vannella. Frontal hyaloplasm consists about half of the body. Surface smooth, without wrinkles or folds. Length of the locomotive form 14-33 mkm (average 22 mkm). Length/Breadth ratio about 0.9.

  • Floating form of radial type, large central cytoplasmic mass and 4-8 twisted, uneven pseudopodia.

  • Uninucleate, vesicular nucleus 3.7 - 5.6 mkm in diameter. Nucleolus parietal. No crystals in the cytoplasm. No cysts observed.

  • No simple filamants among glycostyles (Page, 1983).

  • Marine. Observed habitat: Channel Coast (UK).

  • This is the only species of Vannella with parietal nucleolus, however one should take into account that it cannot be considered as the ultimate and the only distinctive feature. Size and peculiarities of the locomotive and floating forms must be taken into account as well.

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