Petromyzontidae

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
Kingdom:	Animalia
Phylum:	Chordata
Subphylum:	Vertebrata
Infraphylum:	Agnatha
Superclass:	Cyclostomi
Class:	Petromyzontida
Order:	Petromyzontiformes
Family:	Petromyzontidae A. Risso, 1827
Type species
Petromyzon marinus Linnaeus, 1758
Genera
Caspiomyzon Entosphenus Eudontomyzon Ichthyomyzon Lampetra Lethenteron Petromyzon Tetrapleurodon

Genera

• Caspiomyzon
• Entosphenus
• Eudontomyzon
• Ichthyomyzon
• Lampetra
• Lethenteron
• Petromyzon
• Tetrapleurodon