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Description of Grossglockneria acuta ( anglais )

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Colpodid ciliate measuring 30-70 x 15-40 microns. Shape usually Colpoda maupasi-like, with the anterior end pointed, posterior narrowly rounded, dorsally convex, ventrally sigmoid. In some populations, the shape similar to that of slender specimens of Colpoda aspera or well-fed individuals of Pseudoplatyophrya nana. Overnourished specimens are often spherically distended posteriorally, starved individuals are fusiform and distinctly flattened laterally. The macronucleus is spherical to slightly ellipsoid, about 8 microns in diameter, usually with some large, rarely with many small peripheral nucleoli. Rarely individuals have 2 closely spaced macronuclear fragments. Micronucleus highly refractive, lenticular, about 5 x 3 x 2 microns. Contractile vacuole surrounded by small collecting vesicles during diastole. Excretory pore in centre of posterior pole, about 1.2 microns in diameter. Cortex very flexible, usually deeply furrowed by somatic kineties. Along and between somatic kineties many circa 1 microns, globular extrusomes, difficult to recognize in living cells, but usually heavily impregnated by protargol. Grossglockneria acuta has a very characteristic appearance in protargol slides. The cytoplasm of often crammed with 1-4 microns sized compact food vacuoles in well-fed specimens. Their strong refraction renders cells almost black at low magnification. Starved individuals colourless or brownish. Movement rapid, spiralling, in moderately wide spirals. They cling to soil particles using about 7 microns long cilia of ventral side and about 3 microns long cilia of paroral membrane. Usually 10-11 distinctly spirally coursing ciliary rows, dorsal kineties in anterior quarter particularly densely ciliated; about half of kineties commence along left vestibular margin. Cilia of dikinetids appear fused in some. Paroral membrane semicircular, consists of single row of 15-20 ciliated basal bodies. Adoral organelle usually composed of 3 kineties with 2 basal bodies each. Specimens in which rightmost kinety consists of single basal body only rarely occur. A long, thin bundle of fibers originates from adoral organelle and projects into cytoplasm.
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