†family Spanionematidae Golikov and Starobogatov 1987 (snail)
Parent taxon: Caenogastropoda according to P. Bouchet et al. 2005
Sister taxa: Acteoninoidea, Architaenioglossa, Bithynia, Bourguetia, Cerithimorpha, Cyclophoracea, Dendropupoidea, Dzikella, Goniasmatidae, Idahospira, Meekospiridae, Neogastropoda, Neontaenioglossa, Neotaenioglossa, Palaeostyloidea, Peruneloidea, Perunelomorpha, Pictavia, Polygyrinidae, Pragoscutulidae, Prisconatica, Protorculidae, Provannidae, Pseudomelanoidea, Strobeidae, Subulitoidea, Trinema, Triphoroidea, Ventrosia, Zygopleuroidea
Subtaxa: Spanionema
Ecology: epifaunal