Subgenus

Tetrada (Perplana) Sidaravičiene, 1992


GIT 140-88	Tetrada (Perplana) bisulcata \| Neotsitrella bisulcata Sarv, 1963	Vidzy borehole, Belarus	322	Keila Stage \| ?
GIT 140-89	Tetrada (Perplana) bisulcata \| Neotsitrella bisulcata Sarv, 1963	Vidzy borehole, Belarus	322	Keila Stage \| ?
GIT 140-90	Tetrada (Perplana) bisulcata \| Neotsitrella bisulcata Sarv, 1963	Vidzy borehole, Belarus	322	Keila Stage \| ?
GIT 140-91	Tetrada (Perplana) bisulcata \| Neotsitrella bisulcata Sarv, 1963	Vidzy borehole, Belarus	322	Keila Stage \| ?
GIT 140-92	Tetrada (Perplana) bisulcata \| Neotsitrella bisulcata Sarv, 1963	Vidzy borehole, Belarus	322	Keila Stage \| ?
GIT 140-93	Tetrada (Perplana) bisulcata \| Neotsitrella bisulcata Sarv, 1963	Vidzy borehole, Belarus	322	Keila Stage \| ?
GIT 153-288	Tetrada (Perplana) perplana \| Tallinnopsis perplana (Neckaja, 1953)	Krapivno 21 borehole	218.3	Idavere Substage \| b
GIT 657-28	Tetrada (Perplana) perplana \| Tallinnopsis perplana (Neckaja, 1953)	Lipu 6301 borehole	27.12 - 27.18	Kukruse Stage
GIT 657-56	Tetrada (Perplana) perplana \| Tallinnopsis perplana (Neckaja, 1953)	Lipu 6301 borehole	27.75 - 27.8	Kukruse Stage