Abstract
Numerous sonneratiaceous pollen grains, found in Middle Miocene sediments of central Japan possess both meridional ridges and polar caps with inter-columellate granules Although the exine architecture of these pollen is similar to that of the living Sonneratia alba, a colpal aperture as observable in these fossil pollen grains is only rarely present in Sonneratia or in the fossil Florschuetzia, which is a form-genus showing affinity with the genus Sonneratia. The fossil pollen is described as Florschuetzia claricolpata sp.n. This new species not only has a distributional significance, but also may strengthen the phylogenetic link between the genera Florschuetzia and Sonneratia.
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