Portrait of the haptorid ciliate, Acropisthium mutabile (Perty, 1852). The cell body is ovoid. The posterior tapers to a short point. The anterior end forms a blunt snout with an apical cytostome. Short trichites support the cytopharynx. There is wreath of longer cilia just posterior to the bare anterior snout. The uniform longitudinal somatic kineties are are widely spaced. Three anterior rows of clavate cilia form a dorsal brush. The cytoplasm contains highly refractile crystaline inclusions. The spherical macronucleus is posterior. There is a single posterior terminal contractile vacuole. Collected from freshwater pond near Boise, Idaho May 2004. DIC optics.
This image was taken by William Bourland. He now uses a Zeiss Axioskop 2 with Spot Insight and Spot Flex CCD cameras (Diagnostic Instruments). Image copyright: William Bourland, image used under license to MBL (micro*scope).
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From the collection
Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere
|Description of Acropisthium mutabile: Medium-sized Haptorid ciliate, from 50-100 micrometres long. Body shape variable, from slenderly cylindrical to ovoid, or beet-shaped, with a pointed posterior. Oral aperture is apical, within a wide, bluntly conical snout. The base of the snout is encircled by a ring of long cilia. Body uniformly ciliated, with longitudinal kineties. Ciliation increased in density near the circumoral dikinetids. Clavate kineties forming dorsal brosse. Macronucleus spherical, contractile vacuole in the posterior. Freshwater, eats small algae. |