Observe the hagfish's horny teeth and scaleless exterior covering a cartilaginous skeleton
Hagfishes are primitive, jawless fish.
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Transcript
NARRATOR: Hagfishes, together with lampreys, are considered the most primitive living fishes. The hagfish has a scaleless, eel-like body and a cartilaginous skeleton. It lacks paired fins and jaws. Its mouth is a round, suckerlike opening surrounded by short, horny teeth. The hagfish usually feeds on dead fish and marine invertebrates.