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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.
