I ENTRANCE I

Taxonomy of Fish

Phylum

Chordate

척색동물문

Subphylum

Vertebrata  

척추동물아문

Pisces

어상강

Superclass

Agnatha

무악구상강

Gnathostomata

악구상강

I ENTRANCE I

# 46 phylogenetic orders in fishes containing over 30,000 of cartilageneous and bony fishes

      --- Corresponding to one half of all extant vertebrate species in number

# 4 major types by the end of the Devonian period (345-395 million years ago)

      --- 3 types, agnathan, chondrichthyes and osteichthyes, remained to represent extant fish species