<i>THALASSIOSIRA ECCENTRICA</i> (EHRENB.) CLEVE, <i>T. SYMMETRICA</i> SP. NOV., AND SOME RELATED CENTRIC DIATOMS¹

Abstract

SUMMARY Examination of original material from the Ehrenberg collection plus clonal cultures from the Gulf of Mexico and net hauls from widely separated stations in the world's oceans confirms that Coscinodiscus eccentricus is correctly placed as Thalassiosira eccentrica (Ehrenb.) Cleve. A closely related species, T. symmetrica, is described, with, the main differences being found in the value processes and distribution patterns. The former species is more abundant in inshore waters; the latter has been found in oceanic waters. Comparisons are drawn between these 2 species, T. mendiolana and Planktoniella sol .