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Bacteriastrum
''Bacteriastrum'' is a genus of diatoms in family Chaetocerotaceae.〔Tomas, C. R., Hasle G. R., Syvertsen, E. E., Steidinger, K. A., Tangen, K., Throndsen, J., Heimdal, B. R., (1997). ''Identifying Marine Phytoplankton'', Academic Press.〕 There are more than 30 described species in genus ''Bacteriastrum'', but many of these are not currently accepted, and new species are still added to the genus.〔Sarno, D., Zingone, A. & Marino, D. (1997). ''Bacteriastrum parallelum'' sp. nov., a new diatom from the Gulf of Naples, and new observations on ''B. furcatum'' (Chaetocerotaceae, Bacillariophyta). Phycologia 36: 257-266〕 The type species for the genus is ''Bacteriastrum furcatum'' Shadbolt.
==Description==
''Bacteriastrum'' is a widely distributed marine, planktonic genus. This genus is often associated with ''Chaetoceros'' but differs in radial symmetry and fenestration of setae. The colonies tend to lie in girdle view, and the cells are separated by the curvature of the basal part of the setae, leaving a small gap between the cells. The cells are cylindrical and linked to form filaments. Each cell has several long, radiating setae which may be simple or bifurcate (branched), the setae from adjacent cells are fused. The plastids are discoid. At least one species, ''B. solitarium'', exists as single cells.〔Round, F. E. and Crawford, R. M. (1990). ''The Diatoms. Biology and Morphology of the Genera'', Cambridge University Press, UK.〕
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