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Articulina sagra.
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Bulimina inflata.
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Globigerina bulloides.
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Hastigerina (has-tidge-err-ine-a) pelagica, is one of the pelagic foraminifera, in which the test is formed of almost spherical chambers. The test gives rise to long spines as well as to many pseudopodia. This species contains symbiotic algae, and some are visible as orange dots in the pseudopodial halo around 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 Dave Caron.
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Hastigerina pelagica - this is a large pelagic foraminiferan. There are a number of small central chambers, from which radiate numerous calcite spines and pseudopodia. There is a large fluid bubble capsule which provides buoyancy. This guy has captured a small copepod within the pseudopodial network. Evidently a carnivore, despite the capacity for photosynthesis provided by numerous commensal dinoflagellates. 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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Pavonina flabelliformis.
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Alveolina melo.
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Lagena acuticosta.
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Lagena auriculata.
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Lagena interrupta.
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Lagena pannosa.
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Lagena plumigera.
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Lagena semistriata.
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Lagena spiralis.
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Lagena torquata.
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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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Calocyclas monumentum.
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