新生代貝類からみた太平洋における反熱帯分布の成立過程(<特集>中〜高緯度の両極性分布を持つ生物から見た地球史)

概要

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Hitherto proposed hypotheses explaining the origin of antitropical distributions in marine organisms are reviewed. These are largely divided into two categories, dispersal and vicariance. Several examples of antitropical pairs of marine Cenozoic molluscs in the western Pacific are listed and partly reviewed from the fossil records. Available paleontologic and phylogeographic evidences suggest that the antitropicality is a recurrent phenomenon during the Cenozoic, and that trans-equatorial dispersal during the late Pliocene to Pleistocene is probably the most important factor in making the present antitropical distribution, although our taxonomic knowledge of Cenozoic antitropical molluscs are still insufficient.
2009-03-31