Apteodinium conjunctum, Eisenack and Cookson, 1960

Originally Apteodinium, subsequently Cribroperidinium
Tax. jr. synonym of Apteodinium maculatum Eisenack and Cookson, 1960, according to Backhouse, 1988.

Holotype: Eisenack and Cookson, 1960, pl.1, fig.7; Jan du Chêne et al., 1986, pl.33, figs.7-9
Locus typicus: Roma Formation, Batavia Downs Well at 45 - 9 ft, North Queensland
Stratum typicum: Aptian

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Original description: [Eisenack and Cookson, 1960, p. 5]:

Diagnosis:
Shell relatively thick-walled, shortly ovoidal with a broad hypotheca, a short, abruptly deliminated, pointed apical horn and sometimes as in the type, a short, blunt antapical horn. The girdle, which is usually clearly defined, is rather wide, circular and level with the surface. A large, sometimes circular pylome extends from below the apex to the girdle.

Dimensions:
Type - 80 µm long, 67 µm broad; paratype - 60 µm long, 57 µm broad.