![]() However, only about 14% of these had been described by 2011. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour, or ecological niche. It is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. In biology, a species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. ![]() Intermediate minor rankings are not shown. The hierarchy of biological classification's eight major taxonomic ranks.
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