Pseudothecamoeba proteoides 1-2: locomotive; 3 -
cell, changing the direction of movement; 4: uroid; 5: nucleus in
Scale bar 20 mkm
Locomotive form usually very elongate, a much flattened
cylinder. The cell could be monopodial or divided into several
branches like polypodial amoebians. Amoeba always have the anterior
hyaline cap, if the cell is branched, every of branches bears
the hyaline cap. The posterior end of the cell is narrowed,
usually shrivelled-looking (Page, 1977). Dorsal surface is always
wrinkled, longitudinal surface folds are usual along the posterior
part of the body. Branched forms could have extended hyaline web
between the branches. Length of the monopodial locomotive form
60-275 mkm (average 174 mkm), L/B 1.4 - 10.5 (average 4.0).
Length of the polypodial form 95-280 mkm (average 171 mkm).
Afloat cell is irregular, it changes often the form and
suspends soon at the substrate.
One oblong nucleus, 12-24 mkm in length, with numerous endosomal
granules, situated beneath the nuclear membrane. Cytoplasm of the
cell is highly vacuolised. Among numerous optically empty vacuoles,
2-3 contractile one could be differentiated. Cyst are not known.