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Amphisphaera minor (Clark and Campbell, 1942)

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Shell having two opposite similar basally three-bladed, narrow, needlelike polar spines; spherical cortical shell moderately thick-walled, the surface having four or five circular pores across a radius, these pores within subhexagonal areas, from whose nodal points develop small sepaloid points, but as a whole the surface is neat and trim; medullary shell about 0.25-0.40 diameter of cortical shell, with eight to ten subhexagonal pores across a diameter; polar supporting beams thicker than others. Stylosphaera minor differs from megaxyphos in finer, smaller pores, thinner cortical shell and less prominent sepaloid points making the shell smoother.
(Clark and Campbell) 1942











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