FIGS 39 in Ciliated protozoa from a volcanic crater-lake in Victoria, Australia

FIGS 39±44. Pleuroplites australis; (39) cultured organisms in an oxygen gradient (the air bubble is at the top margin of the photograph). The organisms accumulate at some distance from oxygen-saturated water, i.e. at the oxic-anoxic boundary. Arrows to some conjugating individuals; (40, 44) two di€erent cell shapes, each with two macronuclei. Arrows in (44) to the clavate cilia; (41±43) silver-impregnated specimens: (41, 43) silver-carbonate impregnation; (42) protargol. CV, contractile vacuole; E, extrusomes; FV, food vacuole; K, circumoral kinety; Ma, macronucleus; arrowheads in (43) at the somatic kineties that bear clavate cilia.