FIGURE 4 in Taxonomic clarification of the dinophyte Peridinium acuminatum Ehrenb., Scrippsiella acuminata, comb. nov. (Thoracosphaeraceae, Peridiniales)

FIGURE 4. Tabulation pattern of the thecate cells of Scrippsiella acuminata, comb. nov. A. Apical view of epitheca. B. Ventral view of hypotheca with cingulum and sulcal region. C. Antapical view of hypotheca. D. Apical view of the apical pore complex. E. Apical view of epitheca with unusual additional plates. F. Small-sized thecate cell with unusual additional plates (as homologies to the typical conformation is dubious, plates are not indicated). Abbreviations: Apo: apical pore plate. cp: closing plate. n': apical plate. n": precingular plate. n''': postcingular plate. n'''': antapical plate. na: anterior intercalary plate. nC: cingular plate. pp: pore plate. Sa: anterior sulcal plate. Sd: right sulcal plate. Sm: median sulcal plate. Sp: posterior sulcal plate. Ss: left sulcal plate. x: preapical plate. Arrows in A–C indicate plate overlap pattern.