Coccolithophores are abundant microalgae that play a key role in the ocean carbon cycle through photosynthesis and their production of intricate calcium carbonate coccoliths. Coccolithophores are particularly abundant in the Great Calcite Belt within the Southern Ocean, although these communities remain largely understudied due to their remote location. Mesoscale oceanographic features can influence carbonate export in these r...

The interface between the nutrient‐rich Southern Ocean and oligotrophic Indian Ocean creates unique environmental conditions that can strongly influence biological processes. We investigated protist communities across a mesoscale meander of the Subtropical Front within the Southern Indian Ocean. 18S V9 rDNA metabarcoding suggests a diverse protist community in which the dinoflagellates and parasitic Syndiniales were abundant....

Haptophytes are photosynthetic protists found in both freshwater and marine environments with an origin possibly dating back to the Neoproterozoic era. The most recent molecular phylogeny reveals several haptophyte “mystery clades” that await morphological verification, but it is otherwise highly consistent with morphology-based phylogenies, including that of the coccolithophores (calcifying haptophytes). The fossil coccolith...