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Anthophysa vegetans is a colonial stramenopile, which lives in all shaped colonies at the end of irregular sometimes branching mucoid stalks that become brown with age. Common in sites with high organic loading. Common in Lake Donghu. Phase contrast optics.
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Colony, shown as if attached to the air-water interface. Long brown stalks support small balls of colorless cells.
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Portrait of the colonial chrysophyte, Anthophysa vegetans (Müller, 1773) Stein, 1878. Collected from an ephemeral freshwater puddle on the lawn of a public park near Boise, Idaho.September 2006. DIC.
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Portrait of the colonial chrysophyte, Anthophysa vegetans (Müller, 1773) Stein, 1878. Collected from an ephemeral freshwater puddle on the lawn of a public park near Boise, Idaho.September 2006. DIC.
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Portrait of the colonial chrysophyte, Anthophysa vegetans (Müller, 1773) Stein, 1878. Collected from an ephemeral freshwater puddle on the lawn of a public park near Boise, Idaho.September 2006. DIC.
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Portrait of the colonial chrysophyte, Uroglena volvox (Ehrenberg, 1835). colonies free-swimming, spherical, ellipsoidal or oblong, up to several 100 (rarely >1000)μm in diameter; cells radially arranged in a single layer at the periphery of a gelatinous matrix;the friable colonies are easily disrupted by the pressure of the coverslip. The interior of the matrix is fairly homogeneous or containing a system of fine, radiating and branched stalks to which the cells are attached by their pointed posterior ends; individual cells Ochromonas-like, with 2 flagella of unequal length; chloroplasts 1-2, laminate to discoid, at least in one species containing a pyrenoid; eyespot usally 1 (rarely 2 or lacking); contractile vacuoles 1-3; numerous muciferous bodies located at the cell periphery; nutrition phototrophic and phagotrophic; cell division longitudinal; colony reproduction by constriction into two daughter colonies or by fragmentation; stomatocysts frequently observed, their ornamentation used for species identification; some species of common occurrence in the plankton of lakes and ponds, sometimes bloom-forming, one marine species. Collected from a freshwater dredge pond near Idaho City, Idaho June 2005. Brightfield.
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Portrait of the colonial chrysophyte, Uroglena volvox (Ehrenberg, 1835). colonies free-swimming, spherical, ellipsoidal or oblong, up to several 100 (rarely >1000)μm in diameter; cells radially arranged in a single layer at the periphery of a gelatinous matrix;the friable colonies are easily disrupted by the pressure of the coverslip. The interior of the matrix is fairly homogeneous or containing a system of fine, radiating and branched stalks to which the cells are attached by their pointed posterior ends (visible here); individual cells Ochromonas-like, with 2 flagella of unequal length; chloroplasts 1-2, laminate to discoid, at least in one species containing a pyrenoid; eyespot usally 1 (rarely 2 or lacking); contractile vacuoles 1-3; numerous muciferous bodies located at the cell periphery; nutrition phototrophic and phagotrophic; cell division longitudinal; colony reproduction by constriction into two daughter colonies or by fragmentation; stomatocysts frequently observed, their ornamentation used for species identification; some species of common occurrence in the plankton of lakes and ponds, sometimes bloom-forming, one marine species. Collected from a freshwater dredge pond near Idaho City, Idaho June 2005. Phase contrast.
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Portrait of the colonial chrysophyte, Uroglena volvox (Ehrenberg, 1835). colonies free-swimming, spherical, ellipsoidal or oblong, up to several 100 (rarely >1000)μm in diameter; cells radially arranged in a single layer at the periphery of a gelatinous matrix;the friable colonies are easily disrupted by the pressure of a coverslip. The interior of the matrix is fairly homogeneous or containing a system of fine, radiating and branched stalks to which the cells are attached by their pointed posterior ends (visible here); individual cells Ochromonas-like, with 2 flagella of unequal length; chloroplasts 1-2, laminate to discoid, at least in one species containing a pyrenoid; eyespot usally 1 (rarely 2 or lacking); contractile vacuoles 1-3; numerous muciferous bodies located at the cell periphery; nutrition phototrophic and phagotrophic; cell division longitudinal; colony reproduction by constriction into two daughter colonies or by fragmentation; stomatocysts frequently observed, their ornamentation used for species identification; some species of common occurrence in the plankton of lakes and ponds, sometimes bloom-forming, one marine species. Collected from a freshwater dredge pond near Idaho City, Idaho June 2005.DIC.
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Detail view of cells of the colonial chrysophyte, Uroglena volvox (Ehrenberg, 1835). colonies free-swimming, spherical, ellipsoidal or oblong, up to several 100 (rarely >1000)μm in diameter; cells radially arranged in a single layer at the periphery of a gelatinous matrix;the friable colonies are easily disrupted by the pressure of a coverslip. The interior of the matrix is fairly homogeneous or containing a system of fine, radiating and branched stalks to which the cells are attached by their pointed posterior ends (visible here); individual cells Ochromonas-like, with 2 flagella of unequal length; chloroplasts 1-2, laminate to discoid, at least in one species containing a pyrenoid; eyespot usally 1 as in these cells (rarely 2 or lacking); contractile vacuoles 1-3; numerous muciferous bodies located at the cell periphery;a chrysolaminaran (glucopyranoside storgae polymer) vacuole is visible in the osterior of the cell to the viewer's right; nutrition phototrophic and phagotrophic; cell division longitudinal; colony reproduction by constriction into two daughter colonies or by fragmentation; stomatocysts frequently observed, their ornamentation used for species identification; some species of common occurrence in the plankton of lakes and ponds, sometimes bloom-forming, one marine species. Collected from a freshwater dredge pond near Idaho City, Idaho June 2005.DIC.
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Cyclonexis (sigh-clo-neck-sis) a colonial chrysophyte (stramenochrome), cells are grouped together to form arcs or hoops. Each cell with yellow/brown chloroplasts, and one long and one short flagellum. Phase contrast.
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Dendromonas (den-dro-moan-ass), colonial flagellate, related to the chrysophytes because they have one long flagellum which draws water towards the cells, and a short flagellum. These organisms are heterotrophic and feed on bacteria. Stalk irregular and branching. Phase contrast.
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Ochromonas (och-row-moan-ass) (tentative identification) iconic chrysophyte alga, with two emergent flagella, one long drawing water towards the cell or dragging the cell forward into the water, and with a short flagellum Plastid with chlorophylls a and c giving a browny green colour, eye-spot located at front margin of plastid. Phase contrast.
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ATCC culture 30004. Freshwater.
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ATCC culture 30004.
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Spumella (spew-mell-a), a heterotrophic stramenopile also referred to as Monas. With one long flagellum and one short flagellum which flops over the body. The long flagellum has hairs (not visible with the light microscope), but the presence of which causes fluid to be drawn towards the cell. The current carries particles of food which can be ingested after they make contact with the surface of the cell. Phase contrast.
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Spumella (spew-mell-a) (Monas) (moan-ass) the archetypical colourless chrysophyte (stramenopile), almost certainly secondarily without plastid. With typical long and short flagellum, posterior inclusion is leucosin storage granule. This rounded form is common in stressed cells. Phase contrast.
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Spumella (spew-mell-a) (Monas) (moan-ass) the archetypical colourless chrysophyte (stramenopile), almost certainly secondarily without plastid. With typical long and short flagellum, posterior inclusion is leucosin storage granule. This is a very typical shape for small chrysophytes. Phase contrast.
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Spumella (spume-ell-a) (=Monas) a colourless chrysophyte cell, with two flagella, only one of which is visible here. The flagellum beats with an undulating beat, and water is drawn towards the top of the cell. These organisms usually consume suspended bacteria. Phase contrast. Material from Nymph Creek and Nymph Lake, thermal sites within Yellowstone National Park, photograph by Kathy Sheehan and David Patterson.
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Spumella (spew-mell-a) (Monas) (moan-ass)
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Spumella, a colorless chrysophyte flagellate. Cells are solitary and may be free-swimming or attached to subratum by drawn out posterior as seen here. The cell body is pyriform and truncate anteriorly with two unequal length flagella (the longer with tripartite hairs visible only by electron-microscopy, the short one smooth). Cells are phagotrophic. One or more contractile vacuoles. From temporary rainwater pool in grass field near Boise, Idaho. Phase contrast.
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The cell on the left is very distressed, but is included to show the distinctive long and short flagella of the true chrysophytes. Phase contrast micrograph.