The morphology of Chrysochromulina rotalis sp nov (Prymnesiophyceae, Haptophyta), isolated from the Skagerrak

Chrysochromulina rotalis sp. nov, was isolated from surface water in the Sk agerrak (58 degrees 11'N, 09 degrees 06'E) using the serial dilution cultur e method. The cells are saddle shaped with the appendages inserted subapica lly on the ventral side of the cell. The coiling haptonema measures 2-4 tim es the length of the flagella when extended. The cells contain two golden b rown chloroplasts. The periplast is covered by two types of scale with dimo rphic scale faces. The scales constituting the outer layer bear a short spi ne supported by four struts, the inner layer scales lack protrusions.