Abstract
Homologous habitats (biotopes, geosystems) are similar to each other in their position among other habitats (biotopes, geosystems) of the whole ocean and in physical processes controlling their formation. In pelagic species with discontinuous ranges, their individual populations live in homologous habitats in 90% of cases. For some species the margin of the Pacific tropical zone is more similar to the equatorial zone of the other two oceans. Due to its size, the Pacific Ocean is characterized by (1) a maximal development of latitudinal zonation in the distribution of species and a suppression of circum-continental zonation; (2) of all the oceans, it has the most developed oceanic zone relative to distant neritic ones and, within it, a well developed equatorial part; and (3) the Pacific east-equatorial distant neritic area is the most developed one.

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