|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Helcionelloida - Pelagiellida
It was corrected as Pelagielloidea by Linsley and Kier (1984), Bouchet et al. (2005) and Wagner (2017).
It was assigned to Archaeogastropoda by Runnegar and Jell (1976); to Orthostrophina by Linsley and Kier (1984); to Gastropoda by Knight et al. (1960) and Missarzhevsky (1989); to Mollusca by Bouchet et al. (2005); and to Pelagiellida by Wagner (2017).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.