portrait

Description:

Cells elliptical to oblong from the ventral side, dorso-ventrally flattened. Length 38 - 55 microns, width 16 - 24 microns, breadth (lateral) approximately 12 microns, length to width ratio 2.1 - 2.9. Epicone semi-circular, sloping towards the right. Cingulum relatively deep, initially rising on the ventral side, then descending with the right end tapering 2 - 3 microns from the sulcus. Proximal and distal ends of the cingulum displaced 10 - 12 microns. Transverse flagellum arising in a curved pocket approximately 10 microns long, leading from the proximal end of the cingulum. Sulcus a wedge-shaped indentation, approximately 0.75 of the cell length from the apex. Long narrow groove extending length of the cell from the proximal end of the cingulum to the sulcus. Apical groove originating at the proximal end of the cingulum, continuing in an anticlockwise spiral around the apex. Longitudinal flagellum arising in a pocket 0.3 - 0.4 of the cell length from the apex . Longitudinal flagellar pocket narrow, approximately 1 microns, following a slightly curved path to the sulcal indentation. Nucleus oval, 10 - 12 x 20 - 25 microns, in the central-right side of the hypocone. Chloroplasts absent. Small oil droplets and food particles often present. Fine longitudinal surface striations present, approximately 16 - 18 across the ventral side.