This image was made from samples taken during a scientific cruise in the Pacific. Water was filtered to concentrate the organisms that were present, then dried onto a thin sheet of plastic and then shadowed with a fine layer of metal to provide contrast. The preparation was then observed with an electron-microscope. This technique has been used to document the diversity of marine microbes, especially, protists in the oceans. These images were taken by Naja Voers and provided courtesy of K Buck (MBARI, California) Image copyright: Naja Voers, image used under license to MBL (micro*scope).
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From the collection
Protists of the Pacific Ocean
|Description of Chrysochromulina: Prymnesiophytes (haptophytes), cells variously shaped, sub-spherical, cylindrical, ovoid, pyriform or saddle-shaped, sometimes metabolic, 5.0-10.0 µm, 2 (rarely 4) equal or sub-equal flagella and a haptonema inserted apically, subapically, or in the centre of the concave face of saddle-shaped cells. haptonema variable in length, but often many times longer than the diameter of the cell and often coiling, usually clavate distally and swollen proximally; with 6-7 axonematal microtubules usually, up to 8 chloroplasts, parietal, variously lobed or incised, pyrenoids immersed or bulging, the latter sometimes with a cap of transparent material, eyespot absent, one or more types of body-scale present in one to several layers; the outermost scales often elaborated as saucers, spines, tubs, cylinders, baskets and other forms; under-layers of scales often circular or elliptical plates with a reflexed rim; the proximal surface of all scales with radially arranged fibrils, the distal surface patternless or with spiral or roughly concentrically wound fibrils though pattern sometimes obscured by morphological transformation; may have sexual stages; amoeboid phases and thick-walled resting stages reported occasionally, swims backwards or glides with cell attaching to substrates by haptonema either at the tip or along its length; contractile vacuole in freshwater species; micotrophy common; ingestion of food by pseudopodia, or by involvement of the haptonema; mostly marine, speciose; may not be monophyletic or holophyletic, type species, C. parva Lackey. |