"Conchifera is a subphylum of the phylum Mollusca. It comprises all of the shell-bearing classes of molluscs, including the snails, clams, tusk shells, ammonites, monoplacophorans, and ...
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so on. The other one is Aculifera.
This taxonomic term is used mostly by paleontologists, and not by scientists who study the living molluscs." - (en.wikipedia.org 30.03.2021)