Haeckel
Cephalis chiefly composed of a large, ovoid, thin-walled antecephalic chamber, and a much smaller, spherical, thick-walled eucephalic chamber. Cervical constriction absent. Thorax cylindrical, with ragged termination or distally narrowing into a short, poreless tube. Shell height: ca. 100 µm.
Ref.: Petrushevskaya (1965).