Centrohelid
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The centrohelids or centroheliozoa are a group of heliozoan protists, single-celled eukaryotes with stiff radiating arms supported by microtubules and bearing extrusomes. Their cells are spherical, ra
Raphidiophrys contractilis
Haptista
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Haptista is a group of protists made up of centrohelids and haptophytes. Phylogenomic studies indicate that Haptista is likely closely related to the TSAR supergroup. It is thus one of the earliest di
Centrohelid
…forms, some of which attach to the substrate by a stalk. Centrohelids are the closest relatives of the haptophyte algae, together forming the clade Haptista. Both groups have mineralized scales and at least one thin microtubule-based appendage. The common ancestor of centrohelids lost flagella and probably…
Coccolithus pelagicus