Dorsal bristle complex
Dorsal surfacace of the large hypotrich ciliate, Euplotes eurystomus (Wrześniowski, 1870). The pellicle is colorless and inflexible. There are 9 - 11, (usually 10) rows of dorsal bristles in longitudinal furrows. These dorsal bristle complexes have a complicated structure consisting of dikinetids at the base of a shallow pellicular pit with only the anterior kinetid bearing a bristle. A rosette of cortical ampullae resembling mucocysts radiates from each complex (visible in this image). These dorsal bristles are probably not locomotary but may have a sensory function. Collected from a freshwater aquaculture pond near Boise, Idaho. DIC. 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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Euplotes eurystomus
From the collection
Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere
| Description of Euplotes eurystomus: This is a large (100-160 microns long, 40-90 microns wide) ovoid hypotrich. The buccal region is triangular and there is a single anterior peristomial pouch. The margin to the adoral membranelle zone is high and prominent. The adoral membranelle zone is sigmoid and contains 50-65 membranelles. There are 9 frontoventral, 5 transverse and commonly 4 caudal cirri. The dorsal argyrome is typical of the double-eurystomus type with 10 (8-12) dorsolateral kineties. There are 17-25 dorsal cilia in the central kineties. The macronucleus is typically 3-shaped and there is sometimes a definite concave notch which contains the micronucleus. |
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