![Sample our Environment & Agriculture journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5934/TOC-Subject-Sample-2021-Environment-Agriculture.jpg"})
Abstract
Cocconeis sedimentaria sp. nov. usually occurs associated with SE Pacific bottom sediments but is also epiphytic on green macroalgae. The valves are frequently orbicular, 13-35 μm long and the transapical axis 10-27 μm wide. The sternum valve (or araphid valve) is only submarginally convex, depressed towards the margins and concave towards the sternum. The raphe-stemum valve (or raphid valve) is submarginally concave, elevated towards the sternum and the valvar margin. The raphe is straight and filiform and lies in a narrow sternum. The valvocopula is open at one end and bears fimbriae. Both valves have uniseriate striae. Morphological and structural relationships with similar taxa are discussed.