IUCN threat status:

Not evaluated

Comprehensive Description

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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).

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