CLASSIFICATION OF THE 

 ANIMAL KINGDOM 



Phylum Protozoa (One-celled animals) 



Class Sarcodina Form pseudopods ( Amoeba ) 



Class Mastigophora Flagella (Euglena) 



Class Sporozoa Parasitic (Malaria) 



Class Ciliata Cilia (Paramecium) 



Phylum PoRiFERA (Sponges) 



Class Calcispongiae Calcareous spicules ( limy sponges ) 



Class Hyalospongiae Siliceous spicules (glass sponges) 



Class Demospongiae Highly complex ( bath sponges ) 



Phylum CoELENTERATA ( Two-laycred animals) 



Class Hydrozoa Hydroid polyps and medusae (Obelia) 



Class Scyphozoa True medusae (large jellyfishes) 



Class Anthozoa Polyps only ( corals, sea anemones ) 



Phylum Ctenophora (Sea walnuts) Comb-bearers (Mnemiopsis) 



Phylum Platyhelminthes (Flatworms) 



Class Turbellaria Mostly free-living (Planaria) 



Class Trematoda Parasitic (flukes) 



Class Cestoida Parasitic (tapeworms) 



Phylum Nemathelminthes (Roundworms) 



Class Nematoda Complete digestive tract; no coelom (Ascaris) 



Phylum Annelida (Segmented worms) 



Class Polychaeta Marine; parapodia well developed; setae well developed 



( Neanthes ) 

 Class Archiannelida Degenerate; without parapodia; mainly marine (Poly- 



gordius ) 

 Class Oligochaeta Terrestrial or fresh-water; without parapodia; few setae 



( earthworm ) 

 Class Hirudinea Mostly parasitic; without parapodia or setae; suckers for 



attachment; fresh-water or terrestrial (Hirudo) 



Phylum Arthropoda (Jointed-legged animals) 



Class Onychophora Possess both annelid and arthropod characteristics; paired 



nephridia, cilia in reproductive organs ( annelid char- 

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