KEY TO ANIMAL PHYLA $ 



head usually well differentiated and always with 

 some kind of mouth parts, frequently with antennae. 

 Fresh water and terrestrial. 



Phylum Arthropoda, Larval Insecta, p. 37 



32(23) With jointed appendages at least on the anterior 

 segments. (In a few of the parasitic Crustacea the 

 appendages are modified or disappear in the adult.) 

 Aquatic and terrestrial. 



Phylum Arthropoda, p. 21 



33(10) Gill slits present, opening into the pharynx, usually 

 with internal skeleton of bone or cartilage, outer 

 surface bare, or covered with scales, feathers, or hairs; 

 dorsally placed nervous system. 



Phylum Chordata, p. 46 



