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Heliodiscus asteriscus Haeckel (Figure 15.78). Outer shell lenticular, with
regularly arranged circular pores and ca. 8-15 radial
spines on the equatorial plane; inner shell spherical.
Diameter of cortical shell without spines: 120-200 µm.
Ref: Nigrini and Moore
(1979).
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Sethodiscus macrococcus Haeckel (Figure 15.79). Very similar to H. asteriscus,
but without radial spines. Diameter of cortical shell:
ca. 150 µm. Ref: Haeckel (1887), Boltovskoy and
Riedel (1980).
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