Abstract
Chrysochromulina rotalis sp. nov, was isolated from surface water in the Skagerrak (58°11'N, 09°06'E) using the serial dilution culture method. The cells are saddle shaped with the appendages inserted subapically on the ventral side of the cell. The coiling haptonema measures 2–4 times the length of the flagella when extended. The cells contain two golden brown chloroplasts. The periplast is covered by two types of scale with dimorphic scale faces. The scales constituting the outer layer bear a short spine supported by four struts, the inner layer scales lack protrusions.
