MolluscaBase source details
Verdcourt, B. (1958). A new species of Ptychotrema Mörch (Mollusca: Gastropoda) from Tanganyika together with a check list of the East African species and keys for their determination. Journal of the Linnean Society of London. 43: 714-720.
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Verdcourt, B.
1958
A new species of Ptychotrema Mörch (Mollusca: Gastropoda) from Tanganyika together with a check list of the East African species and keys for their determination
Journal of the Linnean Society of London
43: 714-720.
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Ptychotrema (Parennea) usambarense Verdcourt, 1958 represented as Ptychotrema usambarense Verdcourt, 1958 (original description)