Phanerobranchia Group
Group Phanerobranchia
The phanerobranchs are an informal group and so named because they cannot retract their gills into a distinct pocket below the mantle – visible or obvious (phanero) gills.
Group Phanerobranchia
The phanerobranchs are an informal group and so named because they cannot retract their gills into a distinct pocket below the mantle – visible or obvious (phanero) gills.
