According to the structure of the genitalia Helix pavida and H. nubivaga should be considered separate Xerotricha species. Both species are morphologically extreme among the Helicellinae because of their fragile, corneous shells, with periostracal hairs and without any trace of spiral bands or flecking.

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Nederlandse Malacologische Vereniging

E. Gittenberger, M.R. Alonso, & M. Ibañez. (1989). Helix pavida Mousson, 1872, and H. nubivaga Mabille, 1882 (Gastropoda Pulmonata: Helicidae), poorly known Helicellinae from the Canary Islands. Basteria, 53(4/6), 117–125.