(Balech) Elbr. (Elbrächter, 1993: 177)
Diplopeltopsis perlata Balech (1971: 81, pl. 13, figs 198–207)
Zygabikodinium perlatum (Balech) Elbr. (Elbrächter, 1975: 58–64)
Balech (1976: 40, fig. 27)
Cells small, subspherical, 15–20 µm long, 15–20 µm diameter. Apical horn very short; antapical horns absent. Cingulum broad, non-ascending, bordered by narrow unornam-ented ridges. Sulcal lists inconspicuous. Cell surface densely covered with short (to 0.5 µm long) conical spines of 2 types; one set broader than the other (distinguishable only by SEM). Tabulation 1pa, 3', 2a, 7'', 3c, 6s?, 5''', 2''''; preapical plate within the apical pore small but distinct; 2a plate very large; 1a plate pentaform.
Prydz Bay, East Antarctica; Southern Ocean, near South Georgia (Dodge & Priddle, 1987); Ross Sea (Watanabe, 1982); Lützow-Holm Bay and Terre Adélie (Hada, 1970); south-western Atlantic (Balech, 1968).
The surface ornamentation and distinctive tabulation are diagnostic. The presence of 2 antapical plates help to separate it from much larger, lenticular P. meunierii.