New Contribution to the Morphology and Taxonomy of Four Marine ...

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Figs 21-29. Holosticha heterofoissneri from life (21-27) and after protargol impregnation (28, 29). 21 - ventral view of a typical individual;
22 - to show the arrangement of macronuclear segments and the food vacuoles; note the digested diatom; 23 - lateral view; note the posteriorly
positioned contractile vacuole; 24 - dorsal view, to show the distribution of mitochondria; inset - optical section of cortex; 25 - ventral view of
a thicker form; 26 - extrusomes (cortical granules); 27 - dorsal view, to show the arrangement of the cortical granules (note also the inset); 28,
29 - ventral and dorsal views of infraciliature; arrowhead marks the gap between the anterior and posterior portion of the adoral zone of
membranelles; double-arrowheads indicate the close-set cirri in left marginal row. BC - buccal cirrus, CV - contractile vacuole, DK1, 4, 5 - dorsal
kinety No. 1, 4, 5, EM - endoral membrane, FC - frontal cirri, FTC - frontoterminal cirri, FV - food vacuoles, LMR - left marginal row,
Ma - macronuclei, Mi - micronuclei, MVR - midventral rows, PM - paroral membrane, RMR - right marginal row, TC - transverse cirri. Scale
bars - 50 µm