Rowson B. & Herbert D.G. (2016). The type species and circumscription of the species-rich Afrotropical snail genus Gulella L. Pfeiffer, 1856, based on anatomical and mtDNA data (Mollusca: Eupulmonata: Streptaxidae). Archiv für Molluskenkunde. 145(1): 69-84.
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Rowson B. & Herbert D.G.
2016
The type species and circumscription of the species-rich Afrotropical snail genus <i>Gulella</i> L. Pfeiffer, 1856, based on anatomical and mtDNA data (Mollusca: Eupulmonata: Streptaxidae)