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A bloom of the diatom Rhizosolenia debyana H. Peragallo was observed in the southwestern Gulf of California. This bloom was estimated to be about 22 km long and represents the first record of this species for the area. Total abundance of R. debyana ranged from 2,576,000 to 3,684,000 cells liter-1. Chlorophyll a concentrations ranged from 17.15 to 41.45 mg/m3. Rhizosolenia debyana has a tropical and subtropical distribution.