Abstract
Analysis shows that after reduction of endemic species to their ancestral prototype sp., numbers of species which have reached oceanic archipelagoes and colonized them show a marked similarity for a given taxon on each island group. Relative number of species of each taxon reaching an oceanic island reflects a property of the taxon rather than past or present geographical factors. Relative ability of a taxon to spread and colonize is defined as its Spread Potential and a formula is given for its calculation.

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