User blog comment:WikiBuilder1147/Classification of species/@comment-1743498-20130212212521/@comment-1743498-20130212221410

Well, what I would suggest is just a one-tier system rather than a hierarchy because some creatures can be hybrids between two classes. Something like this:


 * Consumption method: Solid food/Liquivore/Photosynthesis etc.
 * Source of nutrients: Autotroph/Heterotroph/Sapotroph etc.
 * Reproduction method: Spores/Budding etc.
 * Symmetry: Bilateral/Radial
 * Average adult size: 1 meter long/tall
 * Lifespan: in Earth years
 * Respiratory system: Vascular tissue/Warm blood