Do Lampreys Have An Operculum?
Operculum:
The operculum is the bony flap that guards the gills. It opens and closes to let water travel through the gills.
Lampreys:
The sea lamprey is a parasitic fish found in the Atlantic Ocean's northern and western hemispheres. They do not have an operculum.
So, The Lampreys does not have an operculum.