Haptophyte orders

Prymnesiales is an order of Haptophyceae.

Isochrysidales is an order of Haptophyceae.

Coccolithales is an order of Haptophyceae. The Coccolithales has long been considered one of only two orders in the Coccolithophyceae, the other order being the Isochrysidales.

Syracosphaerales is an order of algae consisting of three families: