Nakon isključivanja grupa koje nisu povezane, neformalna grupa Sigmurethra je postala podred Helicina, sa sledećim infraredovima i kolekcijom porodica bez nadporodice:[1][2]
- ^ MolluscaBase eds. (2020). MolluscaBase. Helicina. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=994701 on 2020-08-25
- ^ Bouchet, Philippe; Rocroi, Jean-Pierre; Hausdorf, Bernhard; Kaim, Andrzej; Kano, Yasunori; Nützel, Alexander; Parkhaev, Pavel; Schrödl, Michael; Strong, Ellen E. (2017). „Revised Classification, Nomenclator and Typification of Gastropod and Monoplacophoran Families”. Malacologia. 61 (1–2): 1—526. ISSN 0076-2997. S2CID 91051256. doi:10.4002/040.061.0201.
- ^
WoRMS (2018). „Helicoidei”. World Register of Marine Species.
- ^ WoRMS (2018). „Oleacinoidei”. World Register of Marine Species.
- ^ WoRMS (2018). „Haplotrematoidea H.B. Baker, 1925”. World Register of Marine Species.