: a genus of diatoms (order Pennales) including several (such as P. australis and P. pungens) that occur in algal blooms, produce domoic acid, and cause amnesic shellfish poisoning

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“Pseudo-nitzschia.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Pseudo-nitzschia. Accessed 11 Mar. 2025.

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