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Observed in a sample from the south east equatorial Pacific - huge (300 microns). Image by John Dolan.
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A scanning electron microscopic view of the shell of a nassellarian, polycystine radiolarian. The shells of nassellarian radiolaria are commonly conical or elongate and segmented. Some species, however, consist only of a tripodal arranged set of spines. The central capsule is enclosed within the very small segment at the top of the shell.
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Lagenidiopsis. Amoeba observed in sandy and muddy marine sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using phase contrast optics. This work was supported by the Australian Biological Resources Study.
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Lagenidiopsis. Cell observed in sandy and muddy marine sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Portrait of Lagenidiopsis (species uncertain), a medium-sized shelled marine amoeba of uncertain affinity. The clear ovoid organic shell is slightly flattened and the anterior pseudostome extends into the shell as a tube(seen in this image). The cell body occupies the posterior half of the shell and transmits delicate filose pseudopodia to the exterior through the internal tubular extension of the cell.The filose pseudopodia are seen entering the internal end of the tube in this image. Collected from a commercial saltwater aquarium in Boise, Idaho October 2004. Brightfield illumination.
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Portrait of Lagenidiopsis (species uncertain), a medium-sized shelled marine amoeba of uncertain affinity. The clear ovoid organic shell is slightly flattened and the anterior pseudostome extends into the shell as a tube. The cell body occupies the posterior half of the shell and transmits delicate filose pseudopodia to the exterior through the internal tubular extension of the cell (seen in this image). Collected from a commercial saltwater aquarium in Boise, Idaho October 2004. Phase contrast illumination.
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Portrait of Lagenidiopsis, a medium-sized shelled marine amoeba of uncertain affinity. The clear ovoid organic shell is slightly flattened and the anterior pseudostome extends into the shell as a tube. The cell body occupies the posterior half of the shell and transmits delicate filose pseudopodia to the exterior through the internal tubular extension of the cell (seen in this image). Collected from a commercial saltwater aquarium in Boise, Idaho October 2004. DIC.
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Astrolithium (astro-lith-ee-um) is one of the more commonly encountered acantharea. These star-shaped organisms used to be grouped with polycystines and phaeodarea as radiolaria. These three groups all have inorganic skeletons to which the cytoplasm attaches, usually have an inner condensed area of cytoplasm and an outer more open region, and have a star-like morphology. Like other acantharea, the spines of Astrolithium are made of strontium salts which readily dissolve when the cells die. There are 20 radiating spines which are linked together at the centre of the cell. The outermost region of cytoplasm attaches to the arms with contractile ligaments or myonemes about halfway along their length. The cells often have an orange or brown colour because of the presence of symbiotic dinoflagellates. Phase contrast.
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Astrolithium (astro-lith-ee-um) is one of the more commonly encountered acantharea. These star-shaped organisms used to be grouped with polycystines and phaeodarea as radiolaria. These three groups all have inorganic skeletons to which the cytoplasm attaches, usually have an inner condensed area of cytoplasm and an outer more open region, and have a star-like morphology. Like other acantharea, the spines of Astrolithium are made of strontium salts which readily dissolve when the cells die. There are 20 radiating spines which are linked together at the centre of the cell. This image has been taken with polarised light so the the crystalline appearance of the arms is more evident. Phase contrast with polarised light.
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Astrolithium (astro-lith-ee-um) is one of the more commonly encountered acantharea. These star-shaped organisms used to be grouped with polycystines and phaeodarea as radiolaria. These three groups all have inorganic skeletons to which the cytoplasm attaches, usually have an inner condensed area of cytoplasm and an outer more open region, and have a star-like morphology. Like other acantharea, the spines of Astrolithium are made of strontium salts which readily dissolve when the cells die. There are 20 radiating spines which are linked together at the centre of the cell. As can be seen in this micrograph, the outermost region of cytoplasm attaches to the arms with contractile ligaments or myonemes about halfway along their length. Phase contrast.
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Astrolithium (astro-lith-ee-um) is one of the more commonly encountered acantharea. These star-shaped organisms used to be grouped with polycystines and phaeodarea as radiolaria. These three groups all have inorganic skeletons to which the cytoplasm attaches, usually have an inner condensed area of cytoplasm and an outer more open region, and have a star-like morphology. Like other acantharea, the spines of Astrolithium are made of strontium salts which readily dissolve when the cells die. There are 20 radiating spines which are linked together at the centre of the cell. The outermost region of cytoplasm attaches to the arms with contractile ligaments or myonemes about halfway along their length. Phase contrast.
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Astrolithium (astro-lith-ee-um) is one of the more commonly encountered acantharea. These star-shaped organisms used to be grouped with polycystines and phaeodarea as radiolaria. These three groups all have inorganic skeletons to which the cytoplasm attaches, usually have an inner condensed area of cytoplasm and an outer more open region, and have a star-like morphology. Like other acantharea, the spines of Astrolithium are made of strontium salts which readily dissolve when the cells die. There are 20 radiating spines which are linked together at the centre of the cell. The symbiotic dinoflagellates which give the acantharea an orange or brown colour can be seen here. Differential interference contrast.
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Astrolithium (astro-lith-ee-um) is one of the more commonly encountered acantharea. These star-shaped organisms used to be grouped with polycystines and phaeodarea as radiolaria. These three groups all have inorganic skeletons to which the cytoplasm attaches, usually have an inner condensed area of cytoplasm and an outer more open region, and have a star-like morphology. Like other acantharea, the spines of Astrolithium are made of strontium salts which readily dissolve when the cells die. There are 20 radiating spines which are linked together at the centre of the cell. This image shows a young cell attached to a larger cell. Phase contrast.
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A light microscopic view of a living nassellarian radiolarian (Eucyrtidium acuminata) showing the reddish pigmented cytoplasm within the siliceous, conical shell.
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Orbulina (orb-you-line-a) - light microscopic image of a living planktonic foraminifer showing the large, spherical calcitic shell that encloses a smaller more dense spiral shell attached laterally on the inside. Numerous spines radiate out from the surface of the shell and contain dinoflagellate algal symbionts that are enclosed by the foraminferal cytoplasm that streams outward along the spines.
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Orbulina (orb-you-line-a) universa, a large planktonic foraminiferan, with algae distributed along the radiating pseudopodia. This is a juvenile form, with numerous symbiotic algae. This is an example of one of the four types of large amoebae which is common in the marine water column. Dark ground image by Dave Caron.
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Orbulina universa, a colonial pelagic foraminifera, this is a adult form in which the juvenile chambers are enclosed within a single large chamber. This is an example of one of the four types of large amoebae which is common in the marine water column. Dark ground image by Dave Caron.
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Orbulina universa.
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Acrosphaera (ack-row-sphere-a) spinosa, spherical colonial radiolarian. This is an example of one of the four types of large amoebae which commonly occur in the marine water colum. Dark ground image by N. R. Swanberg.