The taxa that contains the smallest number of species is Genus. The levels of classification from largest to smallest is Kingdom, Phylum, Class, Order, Family, Genus, and Species.
species (sometimes sub-species depending)Species
Species within the class Cephalaspidomorphi, which includes the lampreys, comprise the smallest number of species among vertebrates, with around 38 recognized species.
The taxon domain is the largest, and contains all the others
The species is the smallest and most significant taxon in biological classification. It refers to a group of organisms that can interbreed and produce fertile offspring. Each species is unique and plays a distinct role in ecosystems.
Kingdom is the real taxon that has a clear biological identity as it contains all the organisms.
The order of the Monotremata contains the fewest species, with only five extant species. These species include the platypus and four species of echidnas.
Starting with the Domain, the fifth taxon group is the Order. The taxon groups in order from largest to smallest are Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
taxon
The third smallest in his system is Family.
The smallest group into which an organism is classified is species. Species is the most specific level of classification in the Linnaean system of taxonomy and represents a group of organisms that can interbreed and produce fertile offspring.
Species.
The taxon that includes only organisms that can successfully interbreed is called a species. Members of the same species are able to mate and produce viable, fertile offspring.