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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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Collozoum - a colonial radiolarian, the bright spots being the central capsules of the organisms which make up the colony. Up to 5000 capsules may be present in a colony. These colonies are like long sausages up to several centimetres in length. There is a sheath of organic material, and this may be referred to as gelatin. The colony has a segmented appearance because the components of the colony lie in a matrix around large vacuoles or alveoli. 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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Collozoum, a colonial radiolarian, the bright spots being the central capsules of the organisms which make up the colony. Up to 5000 capsules may be present in a colony. These colonies are like long sausages up to several centimetres in length. The colony has a segmented appearance because the components of the colony lie in a matrix around large vacuoles or alveoli . This is an example of one of the four types of large amoebae which is common in the marine water column. Image by N. R. Swanberg.
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The older coenobium is articulated, the younger one not. Red dots are central capsules
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Sphaerozoum ovodimare.
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Thalassophysa (thal-ass-owe-fie-sa) is a large radiolarian protist has a cytoplasm that is full of bubbles. The bright area in the centre of the cell is the capsule and within this lie most of the cytoplasmic organelles. The yellow colour comes from symbiotic algae living in association with this protozoa. The algae are dinoflagellates from the genus Scrippsiella - the same genus is also found in symbiotic association with the by-the-wind sailor (Velella). The light region towards the outside is the region of the axopodia. This is an example of one of the four types of large amoebae which is common in the marine water column. Dark ground illumination, image by Dave Caron.
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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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Large colonial coenobium or jelly colony, and a single isolated amoeboid central capsule with oil droplet.
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