a 'level of complexity', measured in terms of how differentiated their organ systems are into distinct regions or sub-organs-with a distinct type of construction, which is to say a particular layout of organ systems. Insofar as a general definition of a class is available, it has historically been conceived as embracing taxa that combine a distinct grade of organization-i.e. The class as a distinct rank of biological classification having its own distinctive name (and not just called a top-level genus (genus summum)) was first introduced by the French botanist Joseph Pitton de Tournefort in his classification of plants that appeared in his Eléments de botanique, 1694. 2 Hierarchy of ranks below and above the level of class.
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