Additionally , it suggests a sister taxon relationship exists between the Bivalvia and the Gastropoda .
A phylogenetic study suggests the Polyplacophora form a clade with a monophyletic Aplacophora .
It suggests a sister taxon relationship exists between the Bivalvia and the Gastropoda .
A phylogenetic study suggests the Polyplacophora form a clade with a monophyletic Aplacophora .