Animal Characteristics
 
Animal origins
 
Choanoflagellate
 
Parazoa
 
Porifera
 
Eumetazoa
 
Radiata
 
Cnidaria
 
cnidocyte
 
Bilateria
 
Protostomia
 
protostome characteristics
 
Lophotrochozoa
 
lophophore
 
trochophore
 
Platyhelminthes
 
Annelida
 
Mollusca
 
Ecdysozoa
 
Nematoda
 
Priapulida
 
Arthropoda
 
decapod crustaceans
 
Deuterostomia
 
deuterostome characteristics
 
Echinodermata
 
Chordata
 
chordate characteristics
 
Agnatha
 
Chondrichthyes
 
Osteichthyes
 
Amphibia
 
amniotic egg
 
Reptilia
 
Aves
 
Mammalia
 
mammal characteristics
 
monotremes
 
marsupials
 
placental mammals