Opinions and declarations Rendered by the International Commission on Zoological Nomenclature

Of the 90 gastropod (Mollusca) family-group names placed on the Official List (76 names) or the Official Index (14 names), 36 have been entered with an erroneous source of original publication, resulting in the name being listed with wrong author and/or date. The present paper rectifies errors in the List (29 names) and the Index (7 names). The corrections change the date of precedence of the 29 erroneously cited potentially valid names on the List by 1 to 54 years, but, as far as we have ascertained, this will not cause nomenclatural instability. We determined that the remaining 54 gastropod family-group names on the Official List or Index were listed with current references