Prorocentroid tabulation type
From dinoflaj3
A tabulation type in which there are two large lateral plates (or valves) plus a small apically located cluster of periflagellar platelets in a periflagellar area. Within the periflagellar area are two large pores, the flagellar pore and the accessory pore. The two valves meet at a sagittal suture. Refer to Text-Figure 9F.