Dynamics of Agricultural Development (New Dimensions in Agricultural Geography) (Concept's International Series in Geography No.4)

Fish are classified in several classes by which its study becomes easier. Fish having similar properties are: contained in the same group. Various classes of fish are Thelodonti, Anaspida, Cephalaspidomorphi, Galeaspida, Pituriaspida, Osteostracy, Gnathostomata, Placodermi. jawless fish are classified under the group Thelodonti, which are very similar to Heterostraci, and are not armored. The Pitu...