Phylum of unicellular flagellates which botanists treat as a separate division, Cryptophyta, but which zoologists treat as the flagellate order Cryptomonadida. Some photosynthetic species form commensal relationships with marine corals to their mutual benefit.- Category ID : 422616
Article by Wim van Egmond on the microscopic alga Phaeocystis, which forms part of the phytoplankton and is believed to be the cause of foam on the sea.