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Verdcourt, B. (1985). New taxa of Gulella L. Pfr. and Ptychotrema Mörch (Mollusca, Streptaxidae) from Eastern Africa. Journal of Conchology 32: 109–121.
Verdcourt, B. (1985). New taxa of Gulella L. Pfr. and Ptychotrema Mörch (Mollusca, Streptaxidae) from Eastern Africa. Journal of Conchology 32: 109–121.
