Petromyzon belongs to phylum Chordata, class Cyclostomata (jawless).
Worth remembering: Migrates to fresh water to spawn, then dies.
| Kingdom | Animalia |
|---|---|
| Phylum | ChordataNotochord |
| Class | CyclostomataJawless |
| Common name | Lamprey |
| NCERT | Class 11 Biology, Chapter 4: Animal Kingdom |
Chordata: A notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits at some stage of life.
Cyclostomata: Jawless, with a round sucking mouth; ectoparasites on fish; 6 to 15 pairs of gill slits; cartilaginous skeleton.
| MyxineHagfish | Cyclostomata |