Definitions for "Gill Cover"
A hard, bony plate which covers the gills.
a protective plate that lies over the gills of a fish.
Keywords:  opergulum, see
see Opergulum.
Keywords:  flap, bone, head, side, large
the large, flat bone on the side of the head, covering the gills.
the flap (large thin bones) that cover the gills on each side of the head.