Haeckel
Cephalis and thorax fused, separated from rest of shell by a conspicuous lumbar constriction. Abdomen and postabdominal section cylindrical to spindle-shaped, without external constrictions, with several very regularly arranged transverse rows of small, circular pores. Shell height: ca. 90 µm.
Ref.: Benson (1966), Pterushevskaya (1971a).