Petromyzontidae are a family of lampreys native to the Northern Hemisphere, comprising the vast majority of living lampreys.[1] Petromyzontids have the highest number of chromosomes (164–174) among vertebrates.[2]
| Petromyzontidae | |
|---|---|
| |
| Sea lampreys (Petromyzon marinus) on a lake trout | |
| |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Infraphylum: | Agnatha |
| Class: | Hyperoartia |
| Order: | Petromyzontiformes |
| Family: | Petromyzontidae A. Risso, 1827 |
| Type species | |
| Petromyzon marinus | |
| Genera | |
|
Caspiomyzon | |
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