Prymnesiophyceae
| Prymnesiophyceae | |
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| Coccolithus pelagicus (Coccolithales, fam. Coccolithaceae) | |
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| Class: | Prymnesiophyceae s.s. Casper, 1972, ex Hibberd, 1976 | 
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Prymnesiophyceae is a haptophyte class. Although it was originally described by Casper in 1972, it did not receive a Latin diagnosis (a requirement for valid publication under the International Code of Botanical Nomenclature) until Hibberd provided one in 1976.