original description(ofHelix trifilosa L. Pfeiffer, 1854)Pfeiffer, L. (1854). Descriptions of nineteen new species of Helicea, from the collection of H. Cuming, Esq. <em>Proceedings of the Zoological Society of London.</em> 21(255) (“1853”): 124–128. [14 November]., available online athttps://biodiversitylibrary.org/page/30747259 page(s): 125 [details]