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