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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).

Pterocanium trilobum