Amphidiadema rectangularis subsp. samuelsonii
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"subsp. samuelsonii" (Kjellström, 1973, p.22, fig.18) Lentin and Williams, 1976, p.61. Holotype: Kjellström, 1973, fig.18. Originally Deflandrea rectangularis var. samuelsonii, subsequently Deflandrea rectangularis subsp. samuelsonii, thirdly Amphidiadema rectangularis subsp. samuelsonii. Taxonomic senior synonym: Triblastula (now Hystrichosphaeropsis) quasicribrata, according to Gocht (1976, p.322). Age: Early-Late Maastrichtian. Parent: Amphidiadema rectangularis
