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Description of CollodictyonCircumscription: Heterotrophic flagellates, four similar flagella inserting at the head of a broad ventral groove, ingesting algae via the groove. Ultrastructural identity: Mitochondria with tubular cristae, dictyosomes present, cells without walls, scales, or other excrescences. Synapomorphy: None at this time. The one ultrastructural study to date lacks detail, possibly related to Diphylleia. Composition: Several species. Ref: Klaveness 1995.