Crassispira margaritula is an extinct species of sea snail, a marine gastropod mollusc in the familyPseudomelatomidae, the turrids and allies.[1] Fossils of this extinct marine species were found in Eocene strata of the Paris Basin, France.
Le Renard (J.) & Pacaud (J.-M.), 1995 Révision des Mollusques paléogènes du Bassin de Paris. 2 - Liste des références primaires des espèces. Cossmanniana, t. 3, vol. 3, p. 65-132