what is petromyzonn!!!!!!!!!!!!!
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(1)Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA. Sea lampreys (Petromyzon marinus) are cyclostomes, the most basal extant group of vertebrates, and are thought to have existed largely unchanged for more than 500 million years.
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Petromyzons ( scientific name: Petromyzon marinus) are parasitic sea lampreys found in the Northern Hemisphere.
Unique features:
Body- eel-like
No paired fins
Mouth- round and jawless
Behind the eye- seven branchial openings
As compared to other vertebrates, it has an unusual amount of guanine-cytosine content and also the amino acid usage pattern is different.
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