Traits taxon details
original description
(of ) Thiele, J. (1911). Mollusken der deutschen Zentral-Afrika-Expedition. <i>Wissenschaftliche Ergebnisse der deutschen Zentral-Afrika-Expedition, 1907–1908</i>. Band III, Zoologie I. Leipzig: Klinkhardt & Biermann. Pp. 175–214. [Dated 1912]. page(s): 177, pl. IV, figs 5, 6. [details] 
additional source
Adam, W.; Bruggen, A. C. van; Van Goethem, J. L. (1993). Études sur les mollusques terrestres de l'Afrique, à partir des notes de feu le Dr William Adam. 1. <i>Ptychotrema</i> (<i>Haplonepion</i>) Pilsbry, 1919 (Gastropoda Pulmonata: Streptaxidae). <em>Bulletin de l'Institute Royal des Sciences Naturelles de Belgique, Biologie.</em> 63: 137-157., available online at https://biblio.naturalsciences.be/rbins-publications/bulletin-of-the-royal-belgian-institute-of-natural-sciences-biologie/63-1993/biologie-1993-63_137-157.pdf page(s): 140 [details]
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