Lamprey
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| Lampreys are any jawless fish of the order Petromyzontiformes. The adult lamprey may be characterized by a toothed, funnel-like sucking mouth. Adults physically resemble eels, in that they have no scales. Lacking paired fins, adult lampreys have large eyes, one nostril on the top of the head, and seven gill pores on each side of the head. The unique morphological characteristics of lampreys, such as their cartilaginous skeleton, suggest they are the sister taxon of all living jawed vertebrates, and are usually considered the most basal group of the Vertebrata.
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 American brook lamprey
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