Cyclostomi
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Cyclostomi, often referred to as Cyclostomata is a superclass of vertebrates that comprises the living jawless fish classes: the lampreys and hagfishes. Both groups have jawless mouths with horny epid
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Vertebrate
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Vertebrates, also called craniates, are animals with a vertebral column and a cranium. The vertebral column surrounds and protects the spinal cord, while the cranium protects the brain.
Cyclostomi
…Cyclostomata (, from Ancient Greek κύκλος (kúklos), meaning "circle", and στόμα (stóma), meaning "mouth", and thus, "circular mouth") is a superclass of vertebrates that comprises the living jawless fish classes: the lampreys and hagfishes. Both groups have jawless mouths with horny epidermal structures that function…
Fossilized skeleton (cast) of Diplodocus carnegii, showing an extreme example of the vertebral column that gives the vertebrates their name. The species is a tetrapod, its four legs adapting the fish-like body plan for walking on land. The specimen is 26 m (85 ft) long.
Branchial arches bearing gills in a pike
The Cambrian Haikouichthys, 518 mya
Acanthostega, a Devonian labyrinthodont, c. 365 mya