Planktonic Foraminifera and Polycystina (Radiolaria) depict roughly similar—but not identical—worldwide distribution patterns. Discrepancies affect both cold- and warmwater areas, as well as the latitudinal profile of species richness, which peaks at the equator in Radiolaria, but in the subtropics in Foraminifera. Some differences are probably due to group-specific dissimilarities, but preservational and methodological artifacts play a key role.
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Boltovskoy et al. (2019) studied this question.
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