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Thalassophysa (thal-ass-owe-fie-sa), a spumellarian radiolarian in which the cytoplasm is very clearly differentiated into the condensed inner region contained within the capsule, and the outer frothy later. Numerous symbiotic dinoflagellates (Scrippsiella - which also occurs in the cnidarian Velella) can be seen as orange spots in the cell. 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 N. R. Swanberg.
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Solitary radiolarian, with large numbers of symbiotic (intracellular) dinoflagellates mostly concentrated in two opposed regions, with central capsule surrounded by an extensive pseudopodial net. 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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Spongostaurus (spong-owe-store-us) - a large solitary radiolarian with linked sausage-shaped arms, to give a star-like appearance. 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 N. R. Swanberg.
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Each shell contains numerous large granules
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Colonial radiolarian, with fluid filled vacuoles within the colony. This is an example of one of the four types of large amoebae which is common in the marine water column. Image by Dave Caron
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Calocyclas monumentum.
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Pterocanium trilobum.
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The older coenobium is articulated, the younger one not. Red dots are central capsules
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Haeckels fiugure legend reads .... a small piece of the surface of a living coenobium, seen from the surface. Only four individuals are visible, the central capsule of which contains numerous small nuclei and a central oil-globule. The including spherical lattice-shell is provided with a few (one to four) larger apertures, which are prolonged into short cylindrical tubules. Through these latter radiate bundles of fine pseudopodia, branching and anastomosing, and forming a fine sarcode network between the alveoles of the calymma. On the surface of the alveolated jelly-sphere the pseudopodia form a dense radiating zone. Xanthella or yellow cells are everywhere scattered.
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A living spumellarian radiolarian (Spongaster sp.) that secretes a quadrangular, siliceous, spongiose shell enclosing the central capsule. The greenish tint is caused by numerous algal symbionts enclosed by the peripheral cytoplasm. A halo of cytoplasmic strands (axopodia) radiates from the surface. The axopodia are used to capture food, usually small crustacea (e.g. copepods) or algae.
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Haeckels figure legend reads: A small coenobium or colony in the state of alveolation, forming a jelly-sphere, composed of a great number of capsulated individuals, densely aggregated. Each central capsule contains an oil-globule, and is enclosed by a spherical lattice-shell, which bears a few (one to four) short cylindrical tubules. Each shell is again enveloped by a membranous polyhedral alveole and separated from it by structureless jelly. The thick cortical jelly-envelope, which surrounds the whole spherical colony, exhibits a fine radial striation, produced by radiating pseudopodia; many xanthella or yellow cells are scattered in the calymma.
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