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

It is 76–93 μm long and 65–85 μm wide dorsoventrally and its surface is smooth.

It is identified by a broad ellipsoid apical pore plate surrounded by 31 round pores.

Its first plate occupies 30% of the width of the hypotheca.

This dinoflagellate-related article is a stub.