2 3 Pterobranchia — Vertebrata 



Class Subcl Order 



CEPH ALOCHOR DATA 

 LEPTOCARDIA 



Amphioxi lancelets 



VERTEBRATA 



vertebrates 



AGNATHA [jawless fishes] 

 Cephalaspidomorpha 



Cyclostomata lampreys, hag-fishes, sHme-eels 

 CHONDRICHTHYES [cartilaginous fishes] 

 Elasmobranchii 



Selachii sharks, dogfishes, angel-fishes 



Batoidea skates, rays 

 Holocephali rabbit-fishes 



Chimaerae chimaeras, ratfishes 

 OSTEICHTHYES [bony fishes] 



Actinopterygii [ray-finned fishes] 



Chondrostei 



Holostei gars 



Teleostei 

 Choanichthyes [lobe-finned fishes] 



Crossopterygii coelacanths, etc. 



Dipnoi lungfishes 

 AMPHIBIA (Batrachia) amphibians, batrachians 

 Salientia 



Anura frogs, toads 

 Lepospondyli 



Urodela salamanders, newts 



Apoda (Gymnophiona) caecilians 

 REPTILIA reptiles 

 Anapsida 



Chelonia tortoises, turtles 

 Diapsida 



Rhynchocephalia 



Squamata lizards, snakes 



Crocodilia crocodiles, gavials, alligators, caymans 

 AVES birds 



Neornithes 



Sphenisci {Spheniscijormes) penguins 



Struthiones (Stmthioniformes) ostriches 



