Vannella lata Type strain CCAP 1589/12.
Olympus CK2, Phase contrast
Locomotive forms, floating forms.
Basic references for identification:
- Page F.C. 1988. A new key to freshwater and soil
Gymnamoebia. FBA, Ambleside.
Vannella lata Page, 1988
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
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.
Back to checklist of species