Petromyzontidae

Petromyzontidae (Petromyzontidae) is a family of organisms sharing recent common ancestry and similar characteristics. It contains 8 genuss with 31 known species. Key genus groups include Caspiomyzon, Entosphenus, Eudontomyzon, Ichthyomyzon, Lampetra, and Lethenteron. Among its members, 9 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). It belongs to lamprey (Petromyzontiformes).