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A colonial spumellarian radiolarian, image and identification by Dave Caron. This is an example of one of the four types of large amoebae which is common in the marine water column.
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Dicranastrum furcatum.
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A colonial spumellarian radiolarian (Collosphaera sp.) composed of numerous central capsules (purple porous spheres) connected to one another by cytoplasmic strands and enclosed in a clear gelatinous sheath secreted by the radiolarian cytoplasm.
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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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Section of cell with central capsule, associated black pigment, central nucleus, and calymma. Inset is an endoplasmic vacuole.
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Haeckel says: The central capsule contains numerous spherical nuclei and is enclosed by the hyaline calymma, which forms conical sheaths around the spines.
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Sphaerozoum (sphere-owe-zoo-um), detail of the surface of a colony, in which many individual organisms can be seen. In the centre of each of the bright regions is the capsule. 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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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.
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The central capsules are worm-like. With oil droplets, nuclei, small pigment spots and yellow symbiotic algae.
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A living specimen of a spherical spumellarian radiolarian (Styptosphaera sp.) showing the spherical central capsule enclosed by a spongiose siliceous shell. Numerous cytoplasmic strands (axopodia) radiate outward from the central capsule and bear patches of golden-pigmented algal symbionts.
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Living coenobium, with serpentine central capsules. Numerous yellow algal cells are scattered among the radial pseudopodia.
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Amphilonche (amf-ee-lonk-chee) - an acantharean, the cytoplasm is attached to the radiating spicules by contractile myonemes. Two of the spicules are much longer than the others. 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 Dave Caron.
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Hexaconus serratus.