Karlodinium (car-low-din-ee-um) micrum (previously Gyrodinium galatheanum) has a equatorial flagellum lying in a groove (girdle or cingulum) near the centre of the cell and a second flagellum trailing behind the cell and arising in a longitudinal groove or sulcus. The granular region in the centre of the cell is the nucleus. Differential interference microscopy. This image is of material from Provasoli-Guillard National Center for Culture of Marine Phytoplankton, images taken by David Patterson and Bob Andersen. Image copyright: Bob Andersen and D. J. Patterson, image used under license to MBL (micro*scope).
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Provasoli-Guillard National Center for Culture of Marine Phytoplankton (CCMP)
|Description of Karlodinium micrum: Cells are spherical when not attached to the substrate, hemispherical to oblong when attached and feeding, and 22-50 microns in diameter. The exterior is covered with a test of hollow, blunt-ended, 3-sided calcite spicules about 1-3 microns in length lying flat in a fibrous sheath. The test is penetrated by 8-14 uniformly distributed circular, semipermanent apertures through which short, stiff pseudopodia may extend. Locomotion by lobopodia. Observed to reproduce by binary fission. Individuals with about 9 (2-24) nuclei. Some argue that K. micrum currently is conspecific with Karlodinium veneficum (Bergholtz et al. 2005). |