The Bouchet et al. 2017[1] nomenclator provides an up to date system of Helicoidea. The system is in some parts preliminary, as the authors relied on unpublished (as of 2023) phylogenomic study, which did not include all New World taxa. They classified Epiphragmophoridae, Helminthoglyptidae, Humboldtianidae, Monadeniidae and Xanthonychidae (provisionally also Lysinoidae and Echinichidae) as subfamilies of the last taxon, because there are no deep splits between them in the cited unpublished study (see also Koene & Schulenburg 2005[5]).
Cepolidae, Labyrinthidae and Thysanophoridae constitute the sister group of the remaining Helicoidea.[1]
Razkin et al. (2015)[6] reorganized classification into monophyletic taxa according to the molecular phylogeny. This study is focus on Western Palaearctic species. The Hygromiidae s.l. family was divided into three families, Canariellidae, Geomitridae and Hygromiidae. Moreover, the family Cochlicellidae was including within the Geomitridae family as a tribe (Cochlicellini).
The classification proposed for Western Palaearctic Helicoidea is as follows:
This section needs expansion. You can help by adding to it. (April 2019)
2012 taxonomy
Thompson & Naranjo-García (2012) described a new family Echinichidae and placed it to the superfamily Xanthonychoidea.[7] Therefore, the family Xanthonychidae was moved from Helicoidea to Xanthonychoidea.
According to H. Nordsieck[10] the family Xanthonychidae (sensu Hausdorf & Bouchet) is probably polyphyletic (contains several different lineages) and therefore should be divided into several families.
^Razkin O., Gómez-Moliner B. J., Prieto C. E., Martínez-Ortí A., Arrébola J. R., Chueca L. J. & Madeira M. J. (2015). "Molecular phylogeny of the western Palearctic Helicoidea (Gastropoda, Stylommatophora)". Molecular Phylogenetics and Evolution83: 99–117. doi:10.1016/j.ympev.2014.11.014.
^Thompson F. G. & Naranjo-García E. (2012). "Echinichidae, a new family of dart-bearing helicoid slugs from Mexico, with the description of a new genus and three new species (Gastropoda: Pulmonata: Xanthonychoidea)". Archiv für Molluskenkunde141(2): 197–208. doi:10.1127/arch.moll/1869-0963/141/197-208. preview.
^Poppe G. T. & Tagaro S. P. (2006). "The new classification of Gastropods according to Bouchet & Rocroi, 2005". Visaya, février 2006: 10 pp. PDFArchived 27 September 2007 at the Wayback Machine.
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