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searched word: Vorticella convallaria
Found 1 match(es) in the Formal Descriptions | Vorticella citrina - A yellow species, or variety, in the Vorticella convallaria complex. Sessile peritrich ciliate, 60-120 micrometres. Shape a wide funnel or bell, very changeable. Peristome broad, width often exceeding the length of the body. Colour yellow, or yellow-green (probably a result of diet). Pedicle slender, 4-5 times as long as the body. Macronucleus horseshoe-shaped, short. Freshwater, on aquatic plants.
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| Found 5 match(es) in the Image Captions | Vorticella citrina - Group portrait of Vorticella citrina (Muller 1786) a sessiline peritrich ciliate. Part of the Vorticella convallaria complex.This species is lemon yellow to light green in color. The body has typical inverted bell shape. There is a peristomal lip. Peristomal cilia wind counterclockwise to the cytostome. There are fine annular striations on the cell body. At the aboral pole is a scopula, the organelle that secretes the contractile stalk. The stalk is a contractile myonemes enclosed in by a sheath, which is ovoid in cross section. The stalk contracts in corkscrew fashion unlike the zigzag contraction of the stalk in the similar genus, Haplocaulus. The nucleus is short and horseshoe shaped. There is a single contractile vacuole. Vorticella is not colonial but may be gregarious. Primarily bactiverous. Collected from freshwater pond near Boise, Idaho October 2003. Brightfield optics.
| Vorticella citrina - Individual portrait of Vorticella citrina (Muller 1786) a sessiline peritrich ciliate. Part of the Vorticella convallaria complex. This species is lemon yellow to light green in color. The body has typical inverted bell shape. There is a peristomal lip. Peristomal cilia wind counterclockwise to the cytostome. There are fine annular striations on the cell body (seen here). At the aboral pole is a scopula, the organelle that secretes the contractile stalk. The stalk is a contractile myonemes enclosed in by a sheath, which is ovoid in cross section. The stalk contracts in corkscrew fashion unlike the zigzag contraction of the stalk in the similar genus, Haplocaulus. The nucleus is short and horseshoe shaped. There is a single contractile vacuole. Vorticella is not colonial but may be gregarious. Primarily bactiverous. Collected from freshwater pond near Boise, Idaho October 2003. DIC optics.
| Vorticella convallaria - Vorticella convallaria as illustrated in Shen & Zhang (1990) Biomonitoring Techniques Using Freshwater Microbiota, China Architecture and Building Press.
| Vorticella convallaria - Vorticella convallaria.
| Vorticella convallaria - Electron micrograph of the surface of Vorticella convallaria. Like other peritrichs the pellicle is sculpted into ridges and grooves that circle the cell perpendicular to the aboral/adoral axis of the cell body. Pellicular pores (pp) penetrate the pellicle as cylindrical indentations of the plasma membrane (see Fig.3) that end as clathrin-coated pits. A system of alveoli underlies the plasma membrane and rod-like densities occupy the cytosolic tips of the pellicular ridges. A fibrous epiplasm (ep) covers the inside of the alveoli. Distinct myonemal bands run in the aboral to adoral direction (indicated by arrows) just inside the epiplasm. These bands are associated with the endoplasmic reticulum (er) by unique specializations of the ER (see Fig 17). In this EM preparation the ER has artifactually segmented into vesicles caused by the fixation process. Mitochondria (m) occupy the space between the bands. EM taken on 4/15/71 by R. Allen with Hitachi HU11A TEM. Neg. 9,250X. Bar = 1 micron. This image is available in Richard Allen's collection.
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