(Haeckel)
Cephalis relatively small, with a stout apical horn (undivided cephalis). Thorax an inflated tetrahedron with regularly arranged circular pores, with 3 ribs extending into stout, 3-bladed, slightly curved feet. Abdomen, when present, rudimentary. Shell height (without horn and feet): 100-120 µm.
Ref.: Nigrini and Moore (1979).