Amphidiadema rectangularis ssp. rectangularis
Autonym. Now redundant.

Holotype: Cookson and Eisenack, 1962, pl.1, fig.14 and Jan du Chene et al., 1986a, pl.48, figs.14-15
Locus typicus: Perth Basin, Australia
Stratum typicum: Late Turonian-Middle Senonian

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Original description as Deflandrea rectangularis: [Cookson and Eisenack, 1962, p. 486]:

Description:
Shell elongate, flat, either nearly rectangular in outline or slightly narrowed above the limits of the capsule. Apex truncate to rounded, sometimes with a low central elevation. Antapex truncate to rounded or with slight indications of horns.
Tabulation, girdle and longitudinal furrow absent. Capsule circular to oval in outline, generally reaching the lateral margins of the shell. Wall of shell and capsule smooth, that of the capsule being thinner.

Dimensions:
Holotype: 120 µm long, 60 µm broad; capsule 4-x58 µm broad; pylome 24x26 µm.
Range: 100-130 µm long, 56-64 µm broad.