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Gatto, R. (1991). Paradrilliola and Helicodrillia: two new genera of Turridae (Mollusca: Gastropoda) from the European Tertiary. Memorie di Scienze Geologiche. 43: 233-259.
Gatto, R. (1991). Paradrilliola and Helicodrillia: two new genera of Turridae (Mollusca: Gastropoda) from the European Tertiary. Memorie di Scienze Geologiche. 43: 233-259.