as respectively above and below the rank of order. Any number of further ranks can be used as long as they are clearly defined.

The superorder rank is commonly used, with the ending -anae that was initiated by Armen Takhtajan's publications from 1966 onwards.

History

The order as a distinct rank of biological classification having its own distinctive name (and not just called a higher genus genus summum) was first introduced by the German botanist Augustus Quirinus Rivinus

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