Phylogeography of the tropical planktonic foraminifera lineage globigerinella reveals isolation inconsistent with passive dispersal by ocean currents.
Morphologically defined species of marine plankton often harbor a considerable level of cryptic diversity.Since many morphospecies show cosmopolitan distribution, an understanding of biogeographic and evolutionary processes at the level of genetic diversity requires global sampling.We use a database of 387 single-specimen sequences of the SSU rDNA