Haeckel
Campanulate one-segmented shell with delicate lattice of small, circular pores. Top of cephalis extends into a large, proximally perforated, 3-bladed horn; base is prolonged into 3 stout, perforated, slightly bent feet. Total shell height (including horn and feet): 220-280 µm. Cephalis does not seem to be agree with the family-level diagnosis; probably a plagoniid.
Ref.: Haeckel (1887), Benson (1966).