Lamprey
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Lampreys are a group of jawless fish composing the order Petromyzontiformes, sole order in the class Petromyzontida. The adult lamprey is characterized by a toothed, funnel-like, sucking mouth. The co
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Mouth of a sea lamprey, Petromyzon marinus
Median section of lamprey demonstrating internal anatomy
The cartilaginous skeleton of a lamprey washed up on a beach in North Carolina.
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
Lamprey
…lampreys are more closely related to hagfish, the only other living group of jawless fish, than they are to jawed vertebrates, forming the superclass Cyclostomi. The oldest fossils of stem-group lampreys are from the latest Devonian, around 360 million years ago, with modern-looking forms only appearing during…
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