Figs. 1.SEM of Protoperidinium belizeanum sp. nov. (a) Ventral view. Cell is pyriform with an apical horn and two antapical spines. Apical plate 1' is meta. Cingulum is equatorial and ascending. Cingular wall reticulated (arrowheads). Postcingular plates narrow, qua¬drangular and wide (arrows), (b) Apical pore complex (APC) (X) includes an apical horn and a flange (arrows). Apical horn partially covered with biodetritus. (c) Epitheca excavated ventrally. Location of apical intercalary plate 3a (arrowheads), (d) Hypotheca is round. Cin¬gular list is prominent (arrowheads). Postcingular plates narrow (short arrows). Sulcus deep bordered by narrow list. Antapical spines are two, each with three fins, associated with antapical plates 1" and 2". (e) Thecal surface with three distinct ornamentation: 1) retic¬ulated pattern of ridged hexagonal depressions with a knob at network junctions (arrowheads), 2) depressions with a central rimmed pore (large arrows), and 3) vertical striation of paired particles above intercalary band (short arrows), (f) Depressions with a central rimmed pore (arrows) surrounded by small oblong particles Miniscule pore within the rimmed pore (arrowhead).
EMu: SEM NEGATIVE # 155141; SEM STUB # 155; FIELD # 631-93; ACCESSION # 407168; CATALOG # 1598; FIGURE # 3.
