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This is a single cell of the usually colonial Zoothamnium, showing the contractile spasmoneme within the stalk.
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Portrait of the sessile solitary peritrich ciliate, Propyxidium (Corliss, 1979). The zooid is an elongate inverted bell shape. The short stalk is noncontractile. There is no distinct peristomal lip (unlike the similar Rhabdostyla). The prominent tilted peristomal disc is elevated on a broad stalk. The C-shaped macronucleus is transversely oriented (the two ends of the macronucleus are seen in cross-section here).The single contractile vacuole is in the posterior half of the cell. Propyxidium replaced the preoccupied Pyxidiella. Collected from a freshwater pond near Boise, Idaho. Brightfield illumination.
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Portrait of the solitary peritrich ciliate, Propyxidium (Corliss, 1979). The zooid is an elongate inverted bell shape. The short stalk is noncontractile. There is no distinct peristomal lip (unlike the similar Rhabdostyla). The prominent tilted peristomal disc is elevated on a broad stalk (seen well here). The C-shaped macronucleus is transversely oriented (not well seen in this image). The single contractile vacuole is in the posterior half of the cell. Propyxidium replaced the preoccupied Pyxidiella. Collected from a freshwater pond near Boise, Idaho. Phase contrast illumination.
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Zooid of Opercularia coarctata (CLAPARÃDE & LACHMANN, 1858) ROUX, 1901. Collected from an ephemeral puddle on a flood-irrigated lawn in Boise, Idaho. July 2007. DIC.
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Opercularia coarctata (CLAPARÃDE & LACHMANN, 1858) ROUX, 1901. Collected from an ephemeral puddle on a flood-irrigated lawn in Boise, Idaho. July 2007. DIC. Collected from an ephemeral puddle on a flood-irrigated lawn in Boise, Idaho. July 2007. DIC.
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Opercularia coarctata (CLAPARÃDE & LACHMANN, 1858) ROUX, 1901. Collected from an ephemeral puddle on a flood-irrigated lawn in Boise, Idaho. July 2007. DIC.
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in vivo portrait of Opercularia nutans (EHRENBERG, 1831) STEIN, 1854.Phase contrast.
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Opercularia nutans (EHRENBERG, 1831) STEIN, 1854.DIC.
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Detail view of the stalk of Opercularia nutans (EHRENBERG, 1831) STEIN, 1854. DIC.
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Contracted zooids of Opercularia nutans (EHRENBERG, 1831) STEIN, 1854.DIC.
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Originally described by Ehrenberg under the name Epistylis nutans.
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Opercularia (owe-perk-you-lair-ee-a) penardi is attached by a short non-contractile stalk to the substrate. The cells are contractile and retracted individuals have a folded pellicula. The macronucleus is band-shaped. This specimen was collected in freshwater ponds near Konstanz, Germany. nDifferential interference contrast.
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Scyphidia (sky-fid-ee-a) a peritrich ciliate, the body of Scyphidia constricta is narrowed below the peristome. The stalk takes up about a part of the cell. This specimen was collected in freshwater ponds near Konstanz, Germany. Differential interference contrast.
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Scyphidia (sky-fid-ee-a) a peritrich ciliate, the body of Scyphidia constricta is narrowed below the peristome. The stalk takes up about a part of the cell. At higher magnification we can see the transverse striae of the cortex of Scyphidia constricta. This specimen was collected in freshwater ponds near Konstanz, Germany. Differential interference contrast.
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Brightfield portrait of Campanella umbellaria, a large,colonial, sessile peritrich ciliate. Cell bodies are contractile with finely annulated surface. Branching stalks, lacking myonemes, are non-contractile. Collected in October 2002 from freshwater farm pond near Boise,
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Described by Ehrenberg under the name Epistylis grandis.
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Described by Ehrenberg under the name Epistylis grandis.
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Described by Ehrenberg under the name Epistylis grandis.
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Originally described by Ehrenberg under the name Epistylis flavicans
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Epistylis (ee-piss-still-iss), a peritrich ciliate. The organism has a bell-shaped body and a stalk. The stalk contains no contractile elements (unlike Vorticella or Zoothamnium), and it is by this characteristic that the genus is distinguished. The only cilia present in the trophic cell are the mouth cilia, which form a wreath around the top of the cell before descending into the narrowing buccal cavity. Food vacuoles are formed at the base of this cavity. Locomotor cilia are produced at the rear end of distressed cells which can then break away from the stalk. After division, one daughter cell has the posterior cilia and can swim - and is referred to as a telotroch larva. Differential interference contrast.
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Epistylis (ee-piss-still-iss), a peritrich ciliate. The organism has a bell-shaped body and a stalk. The stalk contains no contractile elements (unlike Vorticella or Zoothamnium), and it is by this characteristic that the genus is distinguished. The only cilia present in the trophic cell are the mouth cilia, which form a wreath around the top of the cell before descending into the narrowing buccal cavity. Food vacuoles are formed at the base of this cavity. Locomotor cilia are produced at the rear end of distressed cells which can then break away from the stalk. After division, one daughter cell has the posterior cilia and can swim - and is referred to as a telotroch larva. This group of cells show that this species can have more than one bell associated with a stalk - i.e. is colonial. Differential interference contrast.