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Morphological Redescription and Morphogenesis of the Marine Ciliate, Pseudokeronopsis rubra (Ciliophora: Hypotrichida)
並列摘要
The morphology and morphogenesis of the marine ciliate, Pseudokeronopsis rubra (Ehrenberg, 1838) isolated from shrimp culturing water of Qingdao (Tsingtao, China), are investigated using protargol silver impregnation. The Qingdao population presents the following characteristics: body slim and reddish, size in vivo 160-200 x 24-40 µm, with longitudinal furrow on the ventral side; brick-red pigments constituting rosettes on dorsal side and ventral arrays along the base of cirri; blood cell-like cortical granules throughout the endoplasm. AZM consisting of 46-60 membranelles; long midventral row with 30 pairs of cirri on average; 2-4 transverse cirri and 4-6 dorsal kineties. The overall pattern of the morphogenetic events resembles the other populations described previously: in the opisthe new basal bodies originate close to intact left midventral cirri; the adoral membranelles primordia (AMP), undulating membranes anlagen (UMA) and fronto-midventral-cirral anlagen (FMA) develop from the growing anarchic primordium. In the proter, the AMP and UMA generate de novo on the surface of the buccal cavity. The FMA originate apokinetally to the right of the parental paroral membrane. The UMA generate the first frontal cirrus, PM and EM in both daughter cells as in other hypotrichs. The AMP, UMA and FMA develop in a usual way as in other urostylids. Marginal cirral rows and dorsal kineties occur within the parental structures. The numerous macronuclear segments divide without prior fusion. Reorganization corresponds to the divisional processes in the opisthe. The most remarkable feature is that the old structures do not participate in the formation of the new organelles.
延伸閱讀
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