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Some Thalassiosira species with one central process (Bacillariophyceae)
Hasle, G.R. (1978). Some Thalassiosira species with one central process (Bacillariophyceae). Norw. J. Bot. 25(2): 77-110
In: Norwegian Journal of Botany. Universitetsforlaget: Oslo. ISSN 0300-1156, more
Peer reviewed article  

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Keywords
    Algae; Organism morphology; Bacillariophyceae [WoRMS]; Thalassiosira P.T. Cleve, 1873 [WoRMS]; Thalassiosira aestivalis Gran, 1931 [WoRMS]; Thalassiosira allenii Takano, 1965 [WoRMS]; Thalassiosira angulata (W.Gregory) Hasle, 1978 [WoRMS]; Thalassiosira nordenskioeldii Cleve, 1873 [WoRMS]; Thalassiosira pacifica Gran & Angst, 1931 [WoRMS]; Marine

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  • Hasle, G.R.

Abstract
    Thalassiosira nordenskioeldii, T. aestivalis, T. pacifica and T. angulata comb.nov. belong to the medium-sized to larger species of the genus, while maximum measured diameter of T. allenii Takano is 20 mu m. All 5 species have one central strutted process, one marginal ring of strutted processes, and one marginal labiate process. They are differentiated by aerolae size, areola array, structure and height of valve mantle, distance between marginal processes, location and size of labiate process compared with adjacent strutted processes, and shape of external part of processes T. angulata was not observed in samples from the Pacific Ocean. None of the 5 species were observed in the material from the southern hemisphere.

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