Evolution and diversification of Braarudosphaera bigelowii

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Our morphometric and genetic studies of living Braarudosphaea bigelowii revealed that size-variation in living B. bigelowii is result of speciation with size-variation. This result suggests that size-diversification in fossil B. bigelowii is indicative of speciation of this taxon in geological age. Morphometric studies of Cenozoic Braarudosphaera showed that morphology and size of Braarudosphaera diversified greatly in the samples from 2.7-1.7Ma, likely corresponds with the low diversity period of coccolithophores.