The materialistic and ecological theory of space, developed by the earliest Greek philosophers helps one understand how the Greeks used spatial criteria to explain zoological differences. The environment has direct, almost mechanical influences on the animals which live there. Spatial divisions let one analyse in a systematic way the material differences between animals. This criterion appears most valid and efficient for dieteticians insofar as they regard the animal as food. And thefield where it is used with the greatest precision is ichthyology to the extent that fishes have only alimentary value.
Classification, Dietetic, Ichtyology, Space, Ancient Greece, Topography.