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