Apteodinium? cribrosum, Cookson and Eisenack, 1968

Stover and Evitt (1978, p.142) considered this to be a "provisionally accepted species" of Apteodinium.

Holotype: Cookson and Eisenack, 1968, fig.1L; Jan du Chêne et al., 1986, pl.14, fig.5.
Paratype: Cookson and Eisenack, 1968
Locus typicus: Perth Basin, Gingin Brook silty limestone at 202-204 ft.
Stratum typicum: lowest Campanian or ?Santonian

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Original description: [Cookson and Eisenack, 1968, p. 112]:

Diagnosis:
Shell pear-shaped, divided by an indistinct girdle into a rounded hypotheca and a narrower epitheca with a short, blunt apical horn. The girdle though indistinct is c. 6 µm wide. The wall of the shell is relatively thick, especially in the antapical region, and seems to be perforated by small, densely arranged pores which give it a coarsely granular appearance in spite of its relatively smooth surface.

Dimensions:
Holotype - 62 µm long, 53 µm wide; Paratype - 85 µm long, 60 µm wide.