Elma was classified within the subfamily Enneinae.[3] Páll-Gergely et al. (2015)[1] classified Elma according to the first internal anatomy research of the genus either in Streptaxinae or in the Gibbinae.
Subgenus Elma (Fultonelma) F. Haas, 1951 : synonym of Pseudelma (Fultonelma)F. Haas, 1951 represented as Pseudelma Kobelt, 1904
Elma (Fultonelma) bisexigua F. Haas, 1951: synonym of Pseudelma (Fultonelma) bisexigua (F. Haas, 1951) represented as Pseudelma bisexigua (F. Haas, 1951) (basionym)
Elma bisexigua F. Haas, 1951: synonym of Pseudelma bisexigua (F. Haas, 1951) (original combination)
^ abcdefgPáll-Gergely B., Hunyadi A., Varga A. & Rowson B. (2015). "Anatomy and taxonomic position of Elma H. Adams, 1866: a high-spired Southeast-Asian genus of Streptaxidae (Gastropoda: Eupulmonata)". Folia Malacologica23(2): 155-164. doi:10.12657/folmal.023.013.
^ abAdams H. (1866). Descriptions of fifteen new species of land and freshwater shells from Formosa, collected by Robert Swinhoe, Esq., consul at Taiwan in that island. Proceedings of the Zoological Society of London34: 316–319, page 317.
^ abcSutcharit C., Naggs F., Wade C. M., Fontanilla I. & Panha S. (2010). "The new family Diapheridae, a new species of Diaphera Albers from Thailand, and the position of the Diapheridae within a molecular phylogeny of the Streptaxoidea (Pulmonata: Stylommatophora)". Zoological Journal of the Linnean Society160: 1-16. doi:10.1111/j.1096-3642.2009.00598.x.
Bavay, A. & Dautzenberg, P., 1912. -Description de coquilles nouvelles de l'Indo-Chine. Journal de Conchyliologie 60: 1-54
Fischer-Piette, E., 1950. Liste des types décrits dans le Journal de Conchyliologie et conservés dans la collection de ce journal (avec planches)(suite). Journal de Conchyliologie 90: 149-180