Elaeocyma subcostaria is an extinct species of sea snail, a marine gastropod mollusk in the family Drilliidae. Patrick De Wever & Annie Cornée, Le contenu paléontologique du Lutétien du bassin de Paris; Muséum national d’Histoire naturelle, Paris (2008)
Distribution This extinct species was found in strata of the Lutetian in France.
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