No, agnatha, which includes jawless fish like lampreys and hagfish, do not have an operculum. Instead of a bony cover over their gills, they typically have a series of openings that lead directly to the gill structures. This distinguishes them from jawed fish, which possess an operculum for protection and movement of water over the gills.
The operculum
This is called the operculum
The flap of tissue that covers a bony fish gill is the bony operculum.
The fin located behind the operculum on a perch fish is the Pectural Fins (paired).
Externally
skin
without jaws
The gills of a fish.
Agnatha, also known as jawless fish, lack jaws and scales. They have a cartilaginous skeleton, a round mouth, and a single nostril on their head. Agnatha are also known for their ability to produce slime as a defense mechanism.
The operculum is part of the respiratory system in fish. It is a bony flap that covers and protects the gills, helping with the process of obtaining oxygen from water.
by the gill slits
with gills; they're fish!