Pessonella
- Pessonella marginata Pussard, 1973 (ref. ID; 649, 6796)
Descriptions
Locomotive form fan-shaped or semicircular. Frontal hyaloplasm often forms deep and relatively narrow antero-lateral crescent, but can also produce usual Vannella-like frontal hyaline area occupying up to half of the cell. Anterior margin often uneven; numerous lobes on the anterior hyaline area; sometimes distinct longitudinal ridges. Posterior margin flattened or slightly convex. Length in locomotion ~35 um, breadth ~45 um. Single nucleus 4-8 um in diameter with several peripheral pieces of nucleolar material. Rate of locomotion 20-24 um/min. Floating form with few short, thick, irregular and sometimes furcating hyaline pseudopodia. Isolated from compost in France. No ultrastructure or type material. Description: Pussard (1973). (ref. ID; 6796)