A new species and a new combination in Protoperidinium sect. Oceanica (Peridiniales, Dinophyceae) from Vietnamese waters

<p>In this study, we described and illustrated details of a new species, <em>Protoperidinium vietnamicum</em> sp. nov., from Vietnamese coastal waters and <em>Protoperidinium curvicorne</em> (Böhm) comb. Nov. is proposed as a new combination. Each cell's size range (length, width, and depth) was measured, and the morphological features of both species described here and selected related species in the Oceanica section were compared. In addition, the ecology and distribution of both species were given.</p>