Description of Amylax triacantha
provided by BioPedia
Cells have a triangular epitheca and two, long posterior spines extending from a square antapex. The sides of the epitheca are almost straight leading to a pronounced apical horn. The girdle is located slightly postmedian and displaced by approximately one girdle width. The sulcus is inconspicuous. The thecal plates are thin compared with other Gonyaulax species, but are covered with reticulations and longitudinal ridges. Plate formula: Po, 3', 2a, 6'', 6c, 4-8s, 5''', 1p, 1''''