…by the more appropriate term Aculifera. All other mollusks are included in the subphylum Conchifera (shell-bearers). The familiar division of the Gastropoda into the subclasses Prosobranchia, Opisthobranchia, and Pulmonata is no longer widely accepted. Similarities in the morphology of the nervous system suggest that the opisthobranchs and pulmonates should be…
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