Biodiversity of recently living invertebrates as the informational source on bottom fauna genesis in the world ocean

Biodiversity valuation of recently living marine invertebrates can be used not only for comparison of population in different latitudinal and vertical zones, but also in order to show historical features of the fauna in these zones. For example, global analysis of living brachiopods’ distribution allows to know the maximum of species and genera (including endemics) in so called «intermediate» zones (subtropical and temperate-cold ones). Differences in geological age of the endemics show to conclusion that intermediate regions especially keep the ancient faunas and play the role of refuses during global climatic differentiations and in the periods between these differentiations they play the role of distributors for marine bottom faunas.