Gambierdiscus polynesiensis is a species of toxic (ciguatoxin- and maitotoxin-like toxicity) dinoflagellate.

It is 68–85 μm long and 64–75 μm wide dorsoventrally and its surface is smooth.

It is identified by a large triangular apical pore plate, a narrow fish-hook opening surrounded by 38 round pores, and a large, broad posterior intercalary plate.

Its first plate occupies 60% of the width of the hypotheca.

This dinoflagellate-related article is a stub.