Then that's not a definition, but a list. However, Duane Gish tried to do this once.
"In the above discussion, we have defined a basic kind as including all of those variants which have been derived from a single stock. We have cited some examples of varieties which we believe should be included within a single basic kind. We cannot always be sure, however, what constitutes a basic kind. The division into kinds is easier the more the divergence observed. It is obvious, for example, that among invertebrates the protozoa, sponges, jellyfish, worms, snails, trilobites, lobsters, and bees are all different kinds. Among the vertebrates, the fishes amphibians reptiles, birds, and mammals are obviously different basic kinds. Among the reptiles, the turtles, crocodiles, dinosaurs, pterosaurs (flying reptiles), and ichthyosaurs (aquatic reptiles) would be placed in different kinds. Each one of these major groups of reptiles could be further subdivided into the basic kinds within each.
Within the mammalian class, duck-billed playtpuses, opossums, bats, hedgehogs, rats, rabbits, dogs, cats, lemurs, monkeys, apes, and men are easily assignable to different basic kinds. Among the apes, the gibbons, orangutans, chimpanzees, and gorillas would each be included in a different basic kind.
When we attempt to make fine divisions within groups of plants and animals where distinguishing features are subtle, there is a possibility of error. Many taxonomic distinctions established by man are uncertain and must remain tentative.
