A = Single cell at different focal planes (BF); B = Central part of valve (DIC). arrowheads=central labiate processes
Size: Diameter = 40-115 µm
Distinctive features: Central labiate processes and with many small areolae per sector
Similar species: S. microtrias
Cupp, E. E. 1943. Marine Plankton Diatoms of the West Coast of North America. Bulletin of the Scripps Inst. Oceanogr. of the University of California. 5: 1-237.
Hasle, G. & Sims, P. A. 1986b. The diatom genera Stellarima and Symbolophora with comments on the genus Actinoptychus. British Phycological Journal., 21: 97-114.
Hasle, G. R. & Syvertsen, E. E. 1996. Marine diatoms. In: Tomas, C. R. (ed.) Identifying marine diatoms and dinoflagellates. Academic Press, Inc., San Diego, p. 5-385.