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Ventral (right) view of Kreyella minuta (Foissner, 1979), one of the smallest known ciliates.Probably synonymous with K. muscicola. The body outline is obovoid to reniform. Flattened ventrally and distinctly convex dorsally. Somatic ciliature is markedly reduced on the left (dorsal) side to one row of anterior dikinetids, which lie in a pellicular notch. There are three concentric semicircular kineties on the right (ventral surface). Cilia are relatively long (about 6 microns). The ventrolateral oral aperture is relatively large extending from the posterior 1/3 to almost the posterior end. There is no cytopharyngeal basket of fibers or trichites. There is a paraoral mebrane on the right margin of the vestibulum and a group of about 7 adoral membranelles on the left margin (seen here). There is a single spherical macronucleus and one micronucleus. The contractile vacuole is located in the posterior half. Scurries rapidly back and forth over the substratum. Although described as being rare, Kreyella is found frequently in freshwater ponds and irrigation ditches in Idaho. Collected from freshwater pond near Boise, Idaho in June 2003.Silver carbonate stain (see Foissner, W.Europ. J. Protistol.27,313-330;1991). Black and white.Brightfield optics.
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Infraciliature (right side) of the small colpodid ciliate, Kreyella minuta (Foissner,1979). The body outline is obovoid to reniform. The right side is flattened and the left distinctly convex. Somatic ciliature is markedly reduced on the left side to two rows of anterior dikinetids (two of the dikinetids are visible anteriorly here). There are two concentric semicircular kineties on the right surface. Cilia are relatively long (about 6 microns). The ventrolateral oral aperture in the posterior 1/3 is relatively large. There is no cytopharyngeal basket of fibers or trichites. A prominent curved paraoral membrane is located on the dorsal margin of the vestibulum. The adoral zone of membranelles is visible here as a series of short parallel lines opposite the paraoral membrane. The dark dots posterior to the oral aperture represent the short postoral kineties. There is a single spherical macronucleus and one micronucleus. The contractile vacuole is located in the posterior ½ (not seen here). This species may be synonymous with Kreyella musicale (Kahl, 1931). Collected from freshwater pond near Boise, Idaho in July 2004. Silver carbonate stain (see Foissner, W.Europ. J. Protistol.27, 313-330;1991). Brightfield.
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Dorsal (left) view of Kreyella minuta (Foissner, 1979), one of the smallest known ciliates.Probably synonymous with K. muscicola. The body outline is obovoid to reniform. Flattened ventrally and distinctly convex dorsally. Somatic ciliature is markedly reduced on the left (dorsal) side to one row of anterior dikinetids, which lie in a pellicular notch. There are three concentric semicircular kineties on the right (ventral surface). Cilia are relatively long (about 6 microns). The ventrolateral oral aperture is relatively large extending from the posterior 1/3 to almost the posterior end. There is no cytopharyngeal basket of fibers or trichites. There is a paraoral mebrane on the right margin of the vestibulum and a group of about 7 adoral membranelles on the left margin (seen here). There is a single spherical macronucleus and one micronucleus. The contractile vacuole is located in the posterior half. Scurries rapidly back and forth over the substratum. Although described as being rare, Kreyella is found frequently in freshwater ponds and irrigation ditches in Idaho. Collected from freshwater pond near Boise, Idaho in June 2003.Silver carbonate stain (see Foissner, W.Europ. J. Protistol.27,313-330;1991). Black and white.Brightfield optics.
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Ventral view of Kreyella minuta (Foissner, 1979), one of the smallest known ciliates.Probably synonymous with K. muscicola. The body outline is obovoid to reniform. Flattened ventrally and distinctly convex dorsally. Somatic ciliature is markedly reduced on the left (dorsal) side to one row of anterior dikinetids, which lie in a pellicular notch. There are three concentric semicircular kineties on the right (ventral surface). Cilia are relatively long (about 6 microns). The ventrolateral oral aperture is relatively large extending from the posterior 1/3 to almost the posterior end. There is no cytopharyngeal basket of fibers or trichites. Two rows of cilia are located on the margin of the vestibulum. There is a single spherical macronucleus and one micronucleus. The contractile vacuole is located in the posterior half. Scurries rapidly back and forth over the substratum. Although described as being rare, Kreyella is found frequently in freshwater ponds and irrigation ditches in Idaho. Collected from freshwater pond near Boise, Idaho in June 2003. DIC optics.
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Ventral (right) view of Kreyella minuta (Foissner, 1979), one of the smallest known ciliates.Probably synonymous with K. muscicola. The body outline is obovoid to reniform. Flattened ventrally and distinctly convex dorsally. Somatic ciliature is markedly reduced on the left (dorsal) side to one row of anterior dikinetids, which lie in a pellicular notch. There are three concentric semicircular kineties on the right (ventral surface). Cilia are relatively long (about 6 microns). The ventrolateral oral aperture is relatively large extending from the posterior 1/3 to almost the posterior end. There is no cytopharyngeal basket of fibers or trichites. There is a paraoral mebrane on the right margin of the vestibulum and a group of about 7 adoral membranelles on the left margin (seen here). There is a single spherical macronucleus and one micronucleus. The contractile vacuole is located in the posterior half. Scurries rapidly back and forth over the substratum. Although described as being rare, Kreyella is found frequently in freshwater ponds and irrigation ditches in Idaho. Collected from freshwater pond near Boise, Idaho in June 2003.Silver carbonate stain (see Foissner, W.Europ. J. Protistol.27,313-330;1991). Black and white.Brightfield optics.
