Peridinium macrapicatum Balech, 1971: 147, Pl. 29 (538-546)
After Balech, 1976: Length 35-63µm, width 40-74µm. Apical plates, especially 3' exceptionally large; sutures between them strongly marked, in relief. 1'' and 7'' very dissimilar in size. Sculpture reticulated. Sulcus very enlarged posteriorly. Planozone or slightly cavozone; cingular lists with dense radii. Two short often curved antapical spines and a pseudospine. Generally the contact between 1' and 2'' is very brief, some thecae ortho.
This species is rarely reported. www.algaebase.org lists this species as 'p' indicating it has not been subject to any kind of verification.