Plankton samples were collected in July-August 1998 in the Andaman Sea near the island of Phuket, Thailand, and 31 clones of Pseudo-nitzschia were established in monoclonal culture and examined by light and electron microscopy. The species found included P. cf. cuspidata, P. delicatissima, P. cf. heimii, P. inflatula, P. pseudodelicatissima and P. sinica. In addition, two clones proved to belong to an undescribed species of Pseudo-nitzschia. The new species, P. micropora sp. nov., is characterized by cells less than 2 μm wide, absence of a central nodule, and striae with two rows of small poroids, each located close to an interstria.
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Priisholm et al. (2002) studied this question.
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