Tautonyms refers to the binomial name having same names of both genus and species, e.g. Gorilla gorilla. Biological nomenclature is a formal system of naming species of living things by giving each a name composed of a generic and a specific part. Cla distics is an approach of biological classification in which organisms are grouped together based on whether or not they have one or more shared unique characteristics that come from the groups last common ancestor and not present in more distant ancestors. Polytypic means more than one type.