STRUCTURAL-ANALYSIS OF THE FLAGELLAR APPARATUS AND THE SCALY PERIPLAST IN CHRYSOCHROMULINA-SCUTELLUM SP. NOV. (PRYMNESIOPHYCEAE, HAPTOPHYTA) FROM THE SKAGERRAK AND THE BALTIC

A new species of the marine nanoplankton, Chrysochromulina scutellum s p. nov., has been found in the Baltic and the Skagerrak close to Hirts hals from where it was isolated. Cells are saddle-shaped with two chlo roplasts. The appendages are inserted ventrally and the coiling hapton ema may extend for more than twice the length of the flagella. The sca ly periplast is made of three different scale types. The underlayer co mprises larger, elongate scales covering the cell surface throughout. Two scale types, in which each scale has a short central spine, are lo cated outside these scales. One of the latter types shows an upright r im and this type is distributed over almost the entire cell. It is rep laced in patches by the third type in which there is a slightly thicke ned margin, allowing overlapping of the scales. The flagellar apparatu s has been examined in detail and is compared with other species of Ch rysochromulina and with other haptophytes. Chrysochromulina scutellum is non-toxic to the brine shrimp Artemia.