Hi Oliver,
Check this work.
Gofas Serge & Jabaud Aurelie, 1996
The relationships of the Mediterranean Trochid gastropods Monodonta
mutabilis (Philippi, 1846) and Gibbula richardi (Payr.,1826). J. Moll.
Stud., 63 : 57-64. London.
Constantine Mifsud
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