Vannella devonica CCAP 1589/5.
Olympus CK2, Phase contrast
Locomotive forms, nucleus.
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
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
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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