From Fensome et al., 2019:
Amphidiadema denticulata, Cookson and Eisenack, 1960a, p.4, pl.1, fig.11.
Holotype: Cookson and Eisenack, 1960a, pl.1, fig.11.
Age: Senonian.

Locus typicus: Carnarvon Basin, Western Australia

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Original description: [Cookson and Eisenack, 1960, p. 4]:

Description:
Middle portion of shell smooth, with convex sides, entirely occupied by the capsule, terminal regions cubical with granular surfaces and denticulate edges. Pylome prominent, hexagonal in outline. Capsule ovoidal, smooth walled, opening by a terminal lid.

Dimensions:
Holotype: 90 µm long, 48 µm broad. Two other examples 57x43 µm and 67x43 µm.