jawless

It hosts type of jawless fish called lamprey which existed 200 million years before dinosaurs.

Marine organisms such as sponges and algae, along with primitive snails, clams, cephalopods and jawless fish called ostracoderms, all suffered as a consequence.

Purification and identification of a novel primitive secretory enzyme catalyzing the hydrolysis of imidazole-related dipeptides in the jawless vertebrate Lethenteron reissneri.

"Instead, our work shows that almost every major vertebrate division, from the earliest armored jawless fish all the way up through sharks and our own ancestors, all started out right near the beach, far inshore of the reef.

Mikrostruktura pantsyrya beschelyustnykh pozvonochnykh silura i devona [Mikrostructure of the armour of the jawless vertebrates from the Silurian and Devonian].

The sea lamprey (Petromyzon marinus) is a jawless vertebrate that during metamorphosis from larvae to parasitic juveniles progressively loses the biliary system until complete biliary degeneration.

Madhav wants the Pakistanis to be jawless because four of them allegedly infiltrated into India.

Moreover, the cartilaginous fish have five to seven pairs of gills, and primitive jawless fish have seven pairs of gills (Romer, 1949).

Hagfishes (Myxinidae) often integrate whole-body knotting movements with jawless biting motions when reducing large marine carcasses to ingestible items.

The creature was probably an ancestor of lampreys, jawless fish that can latch onto prey like a vacuum cleaner hose with teeth, say study coauthor Victoria McCoy of Yale University and colleagues.