Svalbardella australina Cookson, 1965b, p.140, pl.25, figs.1–4. Emendation: Malloy, 1972, p.63, as Svalbardella australina.

Now Palaeocystodinium. Originally Svalbardella, subsequently (and now) Palaeocystodinium.

Holotype: Cookson, 1965, pl.25, fig.4
Locus typicus: Pebble Point Formation, SW. Victoria
Stratum typicum: Paleocene

Original description: Cookson, 1965, p.140
Shell fusiform, tapering gradually from an enlarged central portion with convex sides towards both apex and antapex. The left-hand wall of the antapical portion (when the shell is Iaying with the ventral surface uppermost) narrows suddenly at about 3/4 of its length, in such a way that a small spine-like projection is developed, and then slants towards the pointed apex. The apical portion which terminates in either a bluntish or pointed tip is usually slightly longer than the corresponding antapical portion. The central part of the shell is generally entirely filled with a thin-walled capsule which narrows to varying degrees towards both ends and sometimes extends into the bascs of the narrow portions of the shell (Pl. 25, fig. 2). The archeopyle is small, intercalary and basically, though not always distinctly, hexagonal with alternating long and short sides (Pl. 25, fig. 4). A clearly defined tabulation has not been evident; in a few specimens faint indications of an equatorial girdle and faintly outlined areas are present on the dorsal surface (Pl. 25, fig. 1). A large clear area, frequently evident on the ventral surface (Pl. 25, fig. 2) may possibly be related to a longitudinal furrow.
Shell-membrane thin, c. 0.5 µm, smooth in optical section, faintly granular in surface view; wall of capsule finely and closely granular.
Dimensions: Holotype--270 µm long, 54 µm broad. Range--239-302 µm long, 40-61 µm broad.