Pontosphaera bigelowii Gran & Braarud, 1935
Pentagonal kryptococcoliths comprise trapezoidalsegments separated by sutures that radiate outward from thecentre to the edges rather than converging at the vertices. From aplan view, they exhibit length-slow (+) elongation.
Deflandre, G. 1947a. Braarudosphaera nov. gen., type of a new family of current Coccolithophorids with composite elements. Weekly Proceedings of the Sessions of the Academy of Sciences, Paris. 225: 439-441.
Gran, H. H. & Braarud, T. 1935. A quantitative study of the phytoplankton in the Bay of Fundy and the Gulf of Maine (including observations on hydrography, chemistry and turbidity). Journal of the Biological Board of Canada. 1: 279-467.