Dorsal silverline system
Dorsal silverline system or argyrome of the large hypotrich ciliate, Euplotes eurystomus (Wrześniowski, 1870). The silverline system of each of the many species of Euplotes belongs to one of five distinctive patterns. E. eurystomus is characterized by the "double-eurystomus type" seen in this image. The anterior portion of the adoral zone of membranelles is supported on a pellicular projection or collar (seen here).Stained by the dry silver nitrate method (see Foissner, W.Europ. J. Protistol.27,313-330;1991).Collected from a freshwater aquaculture pond near Boise, Idaho. Brightfield. 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 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. |