Generative archetypes and taxa - A fuzzy set formalization

To avoid artificially partitioning Bauplane and Unterbauplane into discrete categories, a generative formalization of archetypes and taxa is presented based upon fuzzy set theory. The abstract morphological series of Brady ca n be represented as a fuzz set which, in turn, can be used to logically spe cify both archetypes and membership relations of taxa. A well-defined "idea listic morphology" is outlined, one which avoids an intuitive basis, a form al morphology that has precise definitions and rules of archetype construct ion. This formal approach is demonstrated using freshwater crabs.