@@ Magnetotactic bacteria are Gram-negative and represent a diverse group of microorganisms with respect to morphology, physiology and phylogeny. They have a cosmopolitan distribution in water columns or sediments with horizontal chemical stratification. The highest numbers of magnetotactic bacteria are generally found at the oxic-anoxic transition zone or redoxcline. Here, we studied the diversity of magnetotactic bacteria in a seawater pond within an intertidal zone at Huiquan Bay in the China Sea. The pond is composed of a permanently submerged part and a low tide subregion. The magnetotactic bacteria collected from the permanently submerged part display diversity in morphology and taxonomy. Their abundance reached up to 105cells/cm3. Their diverse morphotypes, including cocci, ovoids, rods, vibrios and spirilla were observed, and the coccoid shape was most abundant. The magnetosomes of magnetotactic bacteria arranged in one, two or multiple chains.